[glom/gtkmm4v4] Correct some license headers

[Murray Cumming <murrayc src gnome org>]

commit a6c6d1722ec8e9413b169df20518f4124c6e4eb9
Author: Murray Cumming <murrayc murrayc com>
Date:   Sat Feb 24 12:31:10 2018 +0100

    Correct some license headers
    
    As the only author of these files, I can change the license from
    GPL v2-only to GPL v2 or later.
    
    Bug #790683 (Jeremy Bicha)

 .../printoperation_relationshipsoverview.cc        |   26 +++++++++++--------
 .../printoperation_relationshipsoverview.h         |   26 +++++++++++--------
 glom/print_layout/printoperation_printlayout.cc    |   26 +++++++++++--------
 glom/print_layout/printoperation_printlayout.h     |   26 +++++++++++--------
 4 files changed, 60 insertions(+), 44 deletions(-)
---
diff --git a/glom/mode_design/relationships_overview/printoperation_relationshipsoverview.cc 
b/glom/mode_design/relationships_overview/printoperation_relationshipsoverview.cc
index b959210..a48c7eb 100644
--- a/glom/mode_design/relationships_overview/printoperation_relationshipsoverview.cc
+++ b/glom/mode_design/relationships_overview/printoperation_relationshipsoverview.cc
@@ -1,17 +1,21 @@
-/* gtkmm example Copyright (C) 2006 gtkmm development team
+/* Glom
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
+ * Copyright (C) 2001-2018 Murray Cumming
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
  */
 
 #include "printoperation_relationshipsoverview.h"
diff --git a/glom/mode_design/relationships_overview/printoperation_relationshipsoverview.h 
b/glom/mode_design/relationships_overview/printoperation_relationshipsoverview.h
index 219fe62..15b203b 100644
--- a/glom/mode_design/relationships_overview/printoperation_relationshipsoverview.h
+++ b/glom/mode_design/relationships_overview/printoperation_relationshipsoverview.h
@@ -1,17 +1,21 @@
-/* gtkmm example Copyright (C) 2006 gtkmm development team
+/* Glom
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
+ * Copyright (C) 2001-2018 Murray Cumming
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
  */
 
 #ifndef GLOM_RELATIONSHIPS_OVERVIEW_PRINT_OPERATION_H
diff --git a/glom/print_layout/printoperation_printlayout.cc b/glom/print_layout/printoperation_printlayout.cc
index cc6fb25..ef9df4c 100644
--- a/glom/print_layout/printoperation_printlayout.cc
+++ b/glom/print_layout/printoperation_printlayout.cc
@@ -1,17 +1,21 @@
-/* gtkmm example Copyright (C) 2006 gtkmm development team
+/* Glom
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
+ * Copyright (C) 2001-2018 Murray Cumming
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
  */
 
 #include <glom/print_layout/printoperation_printlayout.h>
diff --git a/glom/print_layout/printoperation_printlayout.h b/glom/print_layout/printoperation_printlayout.h
index de0e432..3f7458b 100644
--- a/glom/print_layout/printoperation_printlayout.h
+++ b/glom/print_layout/printoperation_printlayout.h
@@ -1,17 +1,21 @@
-/* gtkmm example Copyright (C) 2006 gtkmm development team
+/* Glom
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
+ * Copyright (C) 2001-2018 Murray Cumming
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
  */
 
 #ifndef GLOM_PRINT_OPERATION_PRINT_LAYOUT_H