features to add to run_xytest2.py

[seanmacb]

Functions not in run_xytest2.py that are in run_ang.py

• run_xytest2.py does not have a mount_posdown or mount_posup function, similarly the movemount function might be slightly different
• run_xytest2.py does not have ts or tslib modules
• the main call will likely have to be rewritten to account for different move orientations, similar to run_ang.py

[seanmacb]

Nearly ready for testing, just need to move the positioner back to home after each move sequence.
Possible options:

1. Undo all moves in the movesequence - possible, but time consuming (~10s per move, per @rsebok, but possibly warrants testing)
2. Use xylib.transform to get difference in move from position_current and position_home - initial tests indicate that angles would not be calculated properly