PATCH: Complete custom toolbars package (partially rewritten)

["M . Thielker" <balsa t-data com>]

Hi,

 I have rewritten large parts of the custom toolbars package. The interface
now supports having radio buttons and toggle buttons in toolbars and the
toolbar customization dialog is much improved (Thanks, Ali!)

This patch supersedes balsa-custombars.patch, balsa-messagewindowbar.patch,
balsa-morebuttons1.patch and balsa-custombars2.patch and contains all their
functionality.

Melanie

balsa-allcustombars.patch.gz