tile-based spectra/redshift column updates

[sbailey]

This is the next installment in updates to the data models in DESI_SPECTRO_REDUX/SPECPROD/tiles/GROUPTYPE/TILEID/GROUPID, with columns descriptions updated with

update_column_descriptions -i filename.rst [--inplace --force]

I first ran without --inplace --force to see what it would update, and then updated py/desidatamodel/data/column_descriptions.csv if I thought any pre-existing description was better than what we had in column_descriptions.csv. I then reran with --inplace --force to do the actual updates. Exception: I kept the zmtl ZWARN and ZTILED slightly different from the standard descriptions, since zmtl augments the ZWARN flags from redrock, and the standard ZTILEID description is for the mtl ledgers where there actually can be more than one tile, which doesn't apply to zmtl.

This PR also includes the new option --inplace, which is a convenience option equivalent to providing the same --outfile as --infile (i.e. so you only have to write the input filename once, and don't risk a cut-and-paste error or replacing one datamodel with another).

[coveralls]

Coverage: 100.0%. Remained the same when pulling a31e805 on spectra into 180dc7e on main.

[weaverba137]

Just a minor recommendation to clean up formatting on one file where you replaced some footnotes with a bullet list.

[weaverba137]

Also, please update the change log. You may want to merge or rebase with main to avoid possible conflicts on that file.

[weaverba137]

@sbailey, in order to move this along, do you want me to make the requested changes myself?

[sbailey]

@weaverba137 thanks for the offer. I updated the change log and fixed the formatting; the delay was due to also getting clarification about the meaning of some of the columns and footnotes, which I have now also updated. If you can take it from here, I would appreciate that. Thanks.

[weaverba137]

OK, sounds good.