Don't copy qt4 anymore, if build_apps is diasabled, but the qmake variable still defined

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1093 fdac6126-5c0c-442c-9429-916003d36597
add unittest for textured meshes

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1094 fdac6126-5c0c-442c-9429-916003d36597
add hint, that the target mesh can be a triangle or a polymesh

closes #2185

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1095 fdac6126-5c0c-442c-9429-916003d36597