First pass at creating a .mailmap file for git.

This will make it easier to use git blame to identify individual file authors.

Generated with:  "git log --format='%aN <%aE>' | sort -u"
Edited by hand to match nicknames with Credits.txt
Updated .mailmap file
Changed doxygen build file options

Use 'doxygen docs/Doxyfile' to build the documentation.
Updated Doxyfile to latest version.

Changes are cosmetic, but allow for more modification of the defaults.
Merge remote-tracking branch 'emperorarthur/Documentation_Updates'