Rayonix fixes and some mrxv functions

[apeck12]

Most of the changes make the code compatible with the Rayonix.

In addition, retrieve_from_mrxv function and associated fetch_mask task were implemented. The opt_distance task now detects the appropriate mask file using a fetch_latest function added to shortcuts.

[apeck12]

Tasks have been updated in terms of output nomenclature and using fetch_latest (rather than an entry in the yaml) to retrieve the appropriate mask or geom file as needed. Current mfxlv4920.yaml and code have been tested for the following tasks: fetch_mask, fetch_geom, run_analysis, opt_distance, find_peaks, index, stream_analysis.

[fredericpoitevin]

Now that starts to look like something! Thanks so much @apeck12 , I'll make good use of all this today :D

Just a thought: do we want to rename misc/metrology.py as interfaces/metrology_interface.py?

[fredericpoitevin]

Note for later: this could potentially go with another function tasked with defining paths to mrxv, etc. based on the location (SLAC, NERSC, ...). Maybe in some path_interface tool, or something

[fredericpoitevin]

I will merge now, hope it's OK!

[apeck12]

@fredericpoitevin, thanks for merging! I'll put metrology.py into interfaces and rename the contents of interfaces as we discussed earlier (e.g. stream_interface.py -> istream.py) in a separate PR.