Some small fixes and changes:

- Add *.cc files to qtcreator project as well as .cpp and .cxx
  (would be needed for correct generating projects with libmv library).
- Added negate_v2 and negate_v2_v2 functions. They'll be needed for
  camera tracking project.
- Fixed issue with generating proxies from 32bit images.
  (generated jpg-s opened fine in blender, but were dark in osx viewer).
- Marked unused arg in indexer as UNUSED.

build_files/cmake/project_info.py

@@ -104,7 +104,7 @@ def is_glsl(filename):
 
 def is_c(filename):
     ext = splitext(filename)[1]
-    return (ext in (".c", ".cpp", ".cxx", ".m", ".mm", ".rc", ".cc", ".inl"))
+    return (ext in (".c", ".cpp", ".cxx", ".m", ".mm", ".rc", ".cc"))
 
 
 def is_c_any(filename):