scripts: beginning of script for ebeam grid to AR acquisition

Needed by Wouter.
Acqusition still needs to be done.
cl_acquisition: fix comment
gui: small clean up
scripts: basic working version of sparc_ar_spot_grid

seems to work (or at least worked once)
script: small bug fixes and improvements
semcomedi: improve initialisation of scale/resolution

Using scale in the config file ensures that the ROI stays the same (whole area)
Otherwise, no behaviorial changes should happen
gui util: add test for formats_to_wildcards

very basic test case
also move out from conversion, which should be more for number conversion
script: move cl_acquisition.py to its new home