Compare by key, not by list.

[weaverba137]

• Compare HDUs by EXTNAME, not by order in the FITS or model file.
• Compare HDU keywords by keyword, not by order.
• Compare Column names by Column name? Can we at least specify the order of columns in a table?
• This may also make it easier to support required and optional keywords.

[sbailey]

Let's also compare columns by name not by order.

[weaverba137]

Reviving this old ticket as part of everest analysis.

• Done: Compare HDUs by EXTNAME, not by order in the FITS or model file.
  • Although example data files are analyzed in the order of the real HDUs in the real data file, the corresponding data model can have any HDU ordering in principle and is keyed by EXTNAME.
• Done: Compare HDU keywords by keyword, not by order.
  • Keyword lists are converted to sets which have no intrinsic ordering.
  • Missing or extraneous keywords are still identified.
• TO DO: Compare Column names by Column name.
• TO DO: Exact specification for optional HDUs, Keywords and Columns.

[weaverba137]

Compare column names by Column name is now implemented, although some unit tests should be added.

[weaverba137]

Closing this ticket in favor of #86.