Adding multithreading generation of dwaLookups.h
Typo
Fixup whitespace
More whitespace fixes
Merge branch 'dwalookups_threads' of https://github.com/karlrasche/openexr into karlrasche-dwalookups_threads

Conflicts:
	OpenEXR/CMakeLists.txt
Merge branch 'karlrasche-dwalookups_threads' into develop
Fixed warnings (one serious) in threaded dwaLookups.cpp