- Fixed calc_normals_... functions (Missing this pointer)
- Added unittests for the normal calculation functions 


M    src/OpenMesh/Core/Mesh/PolyMeshT.cc
M    src/Unittests/unittests_trimesh_normal_calculations.cc


git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@1036 fdac6126-5c0c-442c-9429-916003d36597