multiview: FSA implementation for compositor ... but
it's not working, I think the problem is the EXR write code
(no big surprise, the code was failing before, I will fix that first and
get back here, and I'm confident it should work)
multiview: openexr clean part 1/?
minimizing the changes compared to trunk
removing multipart (next commit will make multipart its own exr type)

[commit untested, but it shouldn't changed anything]
multiview: creating a new EXR type - MultiView
(no more an option from the previous exrs)
multiview: left over fixes from EXR cleanup
multiview: small cleanup commit - no changes
multiview: stampinfo fix/cleanup
multiview: OSA fix (not tested)
multiview: cleanup on COM_CompositorOperation.cpp
multiview: quieting warning on "label" property for renderviews
multiview: HUGE refactoring of the render code
now all memory usage is sane again, and fail proof.
FSA is still not working in some cases, I think the problem is with the
thread code.

Also not tested is the EXR saving. It should be easy to look at it
later.

I'm happy to commit this ... it took me hours and hours to finally
understand the whole rendering pipeline I need so far.
Merge branch 'multiview' of github.com:dfelinto/blender into multiview