* Read a trajectory and calculate angles and dihedrals.
*
* trj_fn file name of trajectory
- * tpb_fn file name of tpb file
* bAngles do we have to read angles or dihedrals
* bSaveAll do we have to store all in the dih array
* bRb do we have Ryckaert-Bellemans dihedrals (trans = 0)