- building with GHOST/SDL now adds the PREFIX
- image.external_edit operator errors out if the filepath isnt set (was annoying and loaded gimp while running tests)
reported by Keith Boshoff (Wahooney)
Instead of a confusing backtrace popup, tell the user the image editor cannot be found, and where to set the path to it.
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.