…d Rmatrix at a specific element in a matching/scanning loop

* possibility to use all magnets or only a series - code implementation not super-flexible, though...
* possibility to constrain current values in a specific range based on previous iteration in scan;
* possibility to reproduce optics with matched currents, to check actual optics;
* possibility to scan upstream/downstream and combine different scans;
* implemented a switch for cleaning output files;
* appending results to output files;

* prepare .xlsx file for QA scans + .tfs files for reproducing optics;
* compare matched optics and that from actual currents - only values at observation point...
* more flexible code;

…between TM and one of the matched configurations with same phase advance

At the same time, actual mu value at iteration 0 (and no longer the original one) is used for mu-scan