Smoke patch change logs:

v3:
* Added velocity texture.
* Added a gui element to select cache compression mode.

v2:
* Added "Initial Velocity" setting.
* Added possibility to use smoke heat as a texture.
* Fixed: Smoke dissolve didn't work with negative heat.

v1:
* Parallel optimized smoke low and high res code. (OpenMP)
* Code optimizations.
* Changed cache compression to faster one.