* Code cleanup in the space_*.py files.
* Removed layout.column() statement in _MT_ panels, they are useless.
* Only define variables at the beginning of a function!
ui/ --> startup/bl_ui
op/ --> startup/bl_operators
scripts/startup/ is now the only auto-loading script dir which gives some speedup for blender loading too.
~/.blender/2.56/scripts/startup works for auto-loading scripts too.