doxygen/doxygen — pull request #140 by nacho4d (2014-03-17 15:00:20+00:00)
Title: warning fixes

Fixed some inoffensive warnings when building with clang.
* `warning: logical not is only applied to the left hand side of this comparison [-Wlogical-not-parentheses]`
* `warning: '_COMMENTCNV_H' is used as a header guard here, followed by #define of a different macro [-Wheader-guard]`