Doxygen cleanup.

git-svn-id: http://osgworks.googlecode.com/svn/trunk@491 c67418bc-a6eb-11de-8ba5-91705c1537ed
Regression test for YPR computation.

git-svn-id: http://osgworks.googlecode.com/svn/trunk@492 c67418bc-a6eb-11de-8ba5-91705c1537ed
Adding new Orientation class, partially implemented, with initial test added to regression suite. Marking old Quat function as deprecated.

git-svn-id: http://osgworks.googlecode.com/svn/trunk@493 c67418bc-a6eb-11de-8ba5-91705c1537ed