Blender Git Loki

Made weight-painting more bearable :)

- Hotkey CTRL+TAB toggles weightpaint on/off
- If Mesh has no vertex groups yet, it still accepts Weight Paint mode.
Then, on a first painting stroke it creates a default group.
- When combining WeightPaint mode with Bone selecting, if you select a
Bone without vertex group it draws Mesh dark blue. On a first painting
stroke it then also creates a new group, with the Bone name.