Smoke: Add new "Full Sample" option to high resolution smoke panel.

This is hopefully the ultimate solution against smoke blockiness near emitter.

Previously high resolution flow/emitter voxels were generated based on the low resolution ones. So if you had 32 resolution and 4 division high resolution, it still used smoke flow generated from those 32 resolution voxels. Now I introduced a new sampling method called "Full Sample" that generates full resolution flow for for high resolution domain as well.

Read more about it in my blog post: https://www.miikahweb.com/en/blog/2013/05/10/getting-rid-of-smoke-blockiness

Also changed "quick smoke" operator default voxel data interpolation mode to "Cubic B-Spline" to smoothen out it even more.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56665 954f8c5b-7b00-dc11-b283-0030488c597c