Blender Git Loki

Render Branch: Fix problem rendering lamp halo's with some materials
using lightgroups.

Render Branch: Fix wrong (non-normalized) orco coordinates for particle
system with subdivision surfaces disabled, resulted in strange dark spots
when test rendering sintel at subdiv level 0 due to different textures
coordinates.

Render Branch: tweak malloc names to debug memory usage.

Three optimizations for hair sim effectors:

* Multithread calculating effector forces on vertices.
* Avoid unnecessary where_is_object_time call.
* Avoid perlin noise macro that might expand into slow code.

If only we were actually using effectors more, then this might have
been a significant optimization :).

allow negative start frames for point caches

Render Branch: svn merge https://svn.blender.org/svnroot/bf-blender/trunk/blender -r28713:28726

ui tweak

improved cloth solver for hair situations. also, made flexibility dampening use a special mode for hair, that applies it to individual hair strands (you can use internal friction, e.g. the velocity smoothing, for global velocity dampening).

Render Branch: svn merge https://svn.blender.org/svnroot/bf-blender/trunk/blender -r28707:28713

Fix for memory leak when failing to read displacements file.

Fix for failures in read tile tiffs wasn't quite correct, this should work.

Fix for slow raytree build with zero bounding boxes, these would get
split into (0..1, 1..size) children which was very slow. Now it just
doesn't add primitives to the tree if they have a zero bounding box.

Render Branch: svn merge https://svn.blender.org/svnroot/bf-blender/trunk/blender -r28643:28707

Deep shadow buffers are now created and stored tiled, this helps avoid a
memory peak when creating them, and also can save some memory afterwards
by not storing empty tiles. Threading code here was also changed so that
each tile can be rendered by it's own thread, and memarena is now used
to avoid slowness due to malloc mutex locks. There's no setting at the
moment to configure the tile size, fixed to 256x256 currently to avoid
performance problems.

Small correction for loading tiled tiff images in case reading pixels fails.

Fix: always compute dxco/dyco derivatives, previously with shadows disabled
these were not computed but still used in a few places.

Field Buttons:
*Minor spacing problem.

Field Buttons:
* Own row for "use_all_layers", to prevent jumping around of the button in different situations. Also makes single column layout readable again.

Render Branch: small fixes and tweaks:
* better multires error message
* sync blenpluginapi/iff.h with imbuf changes
* remove some unused includes

More exception handling for OpenEXR, to fix a crash when reading
back tiles from a cancelled render.