Rmtable

Renamed two columns that conflicted with SQL reserved keywords:
'catalog' became 'catalog_name'
'interval' became 'obs_interval'
Removed string size specifications from string columns -- they can now be of
dynamic lengths. The length requirements turned out to be entirely unnecessary.

Removed columns that were seen as unnecessary: id, flagA/B/C_name, flagA/B/C_value.
The functionality that the flags gave is not useful given the support for non-standard columns.
The consolidated catalog doesn't really benefit from having those columns, so they can were removed.
The id column, intended to give a unique source numbering to the consolidated catalog, isn't needed.
The aperture column, which describes over how large a sky area the brightness/RM was determined, was added.
Some string lengths were modified to be more consistent.

Added flexibility in terms of handling non-standard columns.
These will not be imported by the input_numpy function by default, but are preserved
under read/write operations (read/write_FITS, read/write_TSV, to_numpy, to_pandas).
Added rmsf_fwhm column, with the caveat that this is only really well-defined for RM synthesis.
Added additional default string options.

Converted tables to table format 1.3, which renames two of the columns to avoid SQL conflicts. No changes to contents of catalog.


This file records the history of changes to the RMTable standard.

Fixed problems with Riseley+ 2018 (POGS-I) catalog entries: rm and rm_err column had incorrect values, fracpol and error were missing, polint and error were in wrong units (mJy instead of Jy).