Blender Git Loki

Merging over some uv editor tweaks from tuhopuu:

- Moved Weld/Align out of transform code, now it's a menu.
- Removed confirmation popups for LSCM unwrapping in the uv editor, didn't
make sense anymore now we have undo.
- Extended select linked, to work more like it does in edit mode:
- L: select linked uvs/faces under the mouse
- Shift+L: select/deselect linked uvs/faces under the mouse
(like shift+click for selecting single uvs/faces)
- Ctrl+L: how L worked before
- More accurate uv selection: when selecting one uv from a group of uvs that
are in the same position, it now selects the uv belonging to the face the
mouse is over, instead of a random uv.
- 'View Selected' (numpad .-key) for both faceselect mode and the uv editor.