Merge branch 'master' into soc-2016-pbvh-painting

Cleanup: unused function

Cleanup: move accumulation structs out of sculpt-session

These were over-allocated to the size of all pbvh nodes.
Now only allocate as-needed,
using the total number of nodes under the brush.

Avoid redundant vert->loop->vert topology lookup

This is only needed for vertex colors, vertices store their own weights,
so this is redundant.

Cleanup: split vert/weight paint into separate members

- Remove unused previous wpaint/vpaint struct members.
- Avoid allocating arrays when they aren't used.

Resolve bug w/ non-airbrush weight-paint blending

Instead of clamping the max-weight (which locked the value at 1.0),
Store the initial weight and maximum strength used for painting.
Repaint only with a higher strength, using the initial weight.

Merge branch 'master' into soc-2016-pbvh-painting

Use BLI_math rounding function, replace sqrtl w/ sqrtf

Cleanup: use shorter uchar, uint type names

Merge branch 'master' into soc-2016-pbvh-painting

Merge branch 'master' into soc-2016-pbvh-painting

Move BKE_pbvh_get_num_nodes out of node-access functions

Also use regular return

Merge branch 'master' into soc-2016-pbvh-painting

Rename Smudge to Smear since we already call this smear in image editor

Merge branch 'master' into soc-2016-pbvh-painting

Fix crash when use_group_restrict is disabled

Move SculptBrushTest initialization out of loop

There is no need to run this every iteration.

Make vertex index assignment shorter

Move view_dot > 0.0 checks to first possible location

Don't create vertex groups when reading weights