Merge pull request #559 from est77/master

Misc. improvements / fixes
OSL emission code, refactor #1.
Merge pull request #560 from est77/OSL_emission

OSL emission code, refactor #1.
small code cleanups.
Added OSL camera coordinate system.
Added missing coordinate system names.
Merge pull request #567 from est77/OSL_camera

OSL camera coordinate systems #1
Fixed PR #567 comments.