Blender Git Loki

Stencil:

Rework projective paint stencil to use an additional image field. This
again ommits the need to go and assign an image to the UV layer in the
image editor.

Also added an extra paint mask tool. This is not yet hooked up to do
anything, but will eventually paint exclusively on the stencil image
only.

Change the clone tool to use the new slot system.

When clone from layer is active, a layer selection will be available in
the the layer panel and the tool will sample from the selected clone
layer.

This is not ideal UI wise, the user has to change between tabs and
panels to set the option - Maybe a good reason to rethink about setting
the layer panel to the right.

This makes the mtface_clone_layer functions and data obsolete for
texture painting.

Merge branch 'master' into soc-2013-paint

Conflicts:
source/blender/blenloader/intern/versioning_270.c
source/blender/editors/sculpt_paint/paint_image_2d.c

Cleanup:

* Header clanup
* Hide Add slot operator for node based materials. This could be a per
engine callback, but for now just disable.

Support for node materials in texture painting.

This will just enamerate any image nodes in the node tree and use that.

Fix masking - it was different from trunk after a recent change

Add some missing notifiers and handledr for image events on the toolbar.
This should solve redraw of layers after strokes.

Minor changes. Still not managed to make update correct.

Adding a new normal slot will use float image for better precision.

Do image update in undo as well. Also bring back some property updates
in layer creation, seems to help with layer panel updates.

Add dependency update to images. Does nice update to material and image
icons for layer panels.

Projection painting:

* Use dm material cache for faster material lookups
* Fix crash when loading file in texpaint mode.

Refactor:

Materials now include a generated texture paint cache. This solves
some irritating issues with calling synchronization functions too
often in many places. Synchronization only occurs in dependency graph
material updates and when we add layers.

Change derived mesh material calculation slightly to make it more
straightforward (access materials by mface->mat_nr)

Fix crash when user removes a texture image from the material in texture
paint mode

Refactor:

* Change naming slightly to add_index to better reflect what the
variable does.

* Simplify undo for paint curves. Only need to call one function prior
to editing.

* Add undo size count for paint curves.

Fix crash after deleting points and adding points.

active index was in an invalid state.

Fixes:

* Undo always got image stack undo elements.
* Selection did not set the active index correctly.

Paint Curves:

* Move paint curve operators and code to separate file.
* Curve operators now should support undo.

Merge branch 'master' into soc-2013-paint

Conflicts:
source/blender/blenloader/intern/versioning_270.c