To end the issues with AA (International) Fonts; the .bfont.tff now is

compiled in (datatoc) and doesn't need installation anymore.

Also reviewed weird path conventions for searching AA fonts;

- U.fontdir is only used as standard search path for fileselecting
- U.fontname stores only full path to AA font if used one
- If a font cannot be found, it always falls back to the compiled in one
- If .B.blend is saved with default font, U.fontname is not set

Also added a button in usermenu "restore default".

When this works as expected, I'll commit changes for installation too.

source/blender/src/SConscript

@@ -8,6 +8,7 @@ src_env.Append (CCFLAGS = user_options_dict['SDL_CFLAGS'])
 
 source_files = ['B.blend.c',
                 'Bfont.c',
+		'bfont.ttf.c',
                 'blenderbuttons.c',
                 'booleanops.c',
                 'booleanops_mesh.c',