Corrected several errors in ins2discus, the import from SHELX to DISCUS
- Generator for I centered space group did not place comma before power
- SCAT commands with explicit formfactors were not interpreted correctly
- Turned symmetry operations in output into generators. Although this is an overkill for most space groups, it ensures that DISCUS will generate all symmetry operations for the space group.
-As a consequence of the latter change, get_symmetry_matrices had to be changed to include a new check if a generated symmetry operation exists.