Blender Git Loki

- Use Smoke code from trunk again:
Unforeseen problems: The new code uses hidden arrays, file based functions. Nils himself describes the code as following in one of his new papers "Unuseable for rising smoke". What a bummer.
- New approach: Backport features as moving obstacles, preconditioned conjugate gradient solver, etc.

- This commit also contains the following code:
Better pressure and divergence calculation, idea taken from NVIDIA (graphic gems #3)

a) Remove file dependencies, doing all in memory now
b) Fix crashes on Smoke init because of missing folder

Now we can start bringing back functionality.

Merge r46323-r46613 from trunk

Use different solver names, uncomment some code. Note: Still needs scene and render folder to be created in the blender install folder, otherwise it crashes. Still only shows empty screen when using memory flags and not file flags

Fix merge error on my part -> Note: Never check the box "ignore spaces"

Fix another compile error caused by an accidental leftover file (scons only)

Merge from trunk r46114-r46322

Branch only modification to enable openmp for windows

Fix compile error with gcc, enable scons compiling

Fix compile warnings with gcc

Fix compile error: Undefined reference zero

Fix memory leaks.

Add debug output:
Using memory flags ("new SolverObject") fails while loading the same grid from file works. Weird.

Fix errors + crashes on several occasion.

Known bug: _flags doesn't get used correctly in the init() of the "Smoke init B"

Backport NAN fix for wavelet noise from trunk

Fix another crash caused by pointcache.
I commented some code to save me some startup time.
Remove the comments in FLUID_3D::init() to create your own setup files.

Use smoke resolution provided by blender

Revert last commit and fix "!" error in precompute loop

Halfway back using original source when seeing the bug

First tests to bring back smoke display, but nothing displays yet for unknown reasons.