Provide FITS card formatting table

We are required to provide a keyword dictionary that describes the value format and possible enumeration for each keyword. I believe something like the following should work. This is adapted from existing instruments: (FOCAS/HSC/AO188), and has examples adapted from AO188. Whitespace-delimited.

Note that we will auto-generate this list from our internal reference code (ics_actorkeys, so the units are not in the comment in this table; they are in the FITS headers.

I separated out the optional Value List in order to allow longer comments. Please comment if this is not acceptable.

There does not seems to be a standard type for types – I see C-like, FITS-like, Fortran-like.

Cardname  Format  Type     Units    Comment                        Value list
---------+-------+--------+--------+------------------------------+----------
D_IMRMOD  %12s    string   -        IMR tracking mode              SID,NON-SID,ADI,STOP,OTHER
D_IMRANG  %9.3f   float    deg      IMR angle                      -

Too make it slightly more readable here is a table of the same data: