Improve internal use of inlines

[Mikhail Zabaluev <mikhail zabaluev gmail com>]

Hi,

Here's another branch that tries to solve some problems with usage of
G_INLINE_FUNC and G_IMPLEMENT_INLINES in Glib:
http://git.collabora.co.uk/?p=user/zabaluev/glib.git;a=shortlog;h=refs/heads/implement-inlines

It consigns all non-inline emissions for functions declared with
G_INLINE_FUNC to one dedicated source file, to make sure no other
source file needs to have G_IMPLEMENT_INLINES defined and possibly
ends up using non-inlined implementations of these functions inside
the library.

Enjoy,
  Mikhail