moved the flag enum into the options scope

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1125 fdac6126-5c0c-442c-9429-916003d36597
merged trunk changes r1003:1124 into python branch

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1126 fdac6126-5c0c-442c-9429-916003d36597
fixed member function overloads and exposed missing functions

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1127 fdac6126-5c0c-442c-9429-916003d36597
added a normal calculation unit test

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1128 fdac6126-5c0c-442c-9429-916003d36597