* autogen.sh : error out with bootstrap help message.
* bootstrap : replaces autogen.sh for the 2.5.x release line.
* bootstrap-2.4 : replaces autogen.sh for the 1.9.x release line.
* configure.in.in : renamed from configure.in and added substitution
for version, dependencies, CFLAGS and CSFLAGS.
* README : bootstrap docs
* */*-api.raw : moved to api-2.6.raw for bootstrapping.
* */*-api-2.4.raw : added 2.4 api files for bootstrapping.
* */glue/Makefile.am : add GTK_SHARP_VERSION_CFLAGS.
* pango/Attribute.cs : add a #if GTK_SHARP_2_6 block.
* pango/glue/attribute.c : add a couple #ifdef GTK_SHARP_2_6 blocks.
* sample/GtkDemo/* : make the 2.6 demos conditional.
svn path=/trunk/gtk-sharp/; revision=44047
