GAMSOR execution performance issue

The implemented logic in PyGAMSOR is very inefficient and leads to very high computing time (currently stuck for >12h on this loop) for a full model.

        # Add logic to detect ERRORS into DIF3D output
        for l in range(len(lines1)):
            if "FATAL ERROR(S) HAVE BEEN FOUND" in lines1[l]:
                self.user_object.write_err_lines("ERROR: GAMSOR Step 1 simulation has crashed")

For the ABTR tutorial, Sample 7, this python processing takes ~2-3min:

---   0 hour -  0 min - 44 sec ---        Run  GAMSOR Step 1
---   0 hour -  3 min - 31 sec ---        Run  GAMSOR Step 2
---   0 hour -  4 min - 38 sec ---        Run  GAMSOR Step 3