Blender Git Loki

* Fixed layer brush so that it works in subtract mode.
* Shift key can no longer turn Contrast into Flatten and visa versa
* reduced the range in which brush changes transparency so that it doesn't become too bold or too hard to see
* the old brush cursor no longer changes opacity so that it does not become too hard to see
* if the on-surface brush radius shrinks to smaller than 6 pixels, it is drawn as a solid circle to avoid it becoming hard to see
* adjusted thickness of on-surface brush upwards so that it doesn't get too thin
* when drawing anchored, the on-surface brush now drawn outside of the area being affected
* renamed Restore Mesh to Drag and Drop