Fix for slight roundoff error that pushed acos() param outside range -1..1.

git-svn-id: http://osgworks.googlecode.com/svn/trunk@494 c67418bc-a6eb-11de-8ba5-91705c1537ed
Modify Orientation class to support extracting YPR.

git-svn-id: http://osgworks.googlecode.com/svn/trunk@495 c67418bc-a6eb-11de-8ba5-91705c1537ed
Minor, update to deprecation notice.

git-svn-id: http://osgworks.googlecode.com/svn/trunk@496 c67418bc-a6eb-11de-8ba5-91705c1537ed
add a macro to throw a compiler warning about using the deprecated method.

git-svn-id: http://osgworks.googlecode.com/svn/trunk@497 c67418bc-a6eb-11de-8ba5-91705c1537ed