Fix typo "..C" file.
Fix omission of Data/NmrReference.C, which results in missing object at link time.
Fix qgl build issue with Viewer.h.
Explicitly include cstdlib for std::atexit() functionality. Fixes clang build in Yosemite.
Merge branch 'Yosemite_Build'

* Yosemite_Build:
  Explicitly include cstdlib for std::atexit() functionality. Fixes clang build in Yosemite.
  Fix qgl build issue with Viewer.h.
  Fix typo "..C" file. Fix omission of Data/NmrReference.C, which results in missing object at link time.

Conflicts:
	src/CMakeLists.txt