Bump version number of OpenMesh to 3.3

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1111 fdac6126-5c0c-442c-9429-916003d36597
Fixed compilation documentation to include Qt5 and latest compilers

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1112 fdac6126-5c0c-442c-9429-916003d36597
New acg logo for OpenMesh

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1113 fdac6126-5c0c-442c-9429-916003d36597