Updating requirements for new catalogues

[antonioiuliano2]

Dear eada developers,

I am using eada to perform catalogue conesearch, usually with the VOU-Blazars software.
As I have reported in #8 , some new catalogues are not compatible with the pyvo version which eada is currently built with.

I have found that this can be solved by setting in the setup the version pyvo==1.5, and since it requires at least astropy>4, it is also required to change the astropy version.

Other changes, related to the new pyvo, astropy and python versions:

• scsTab.votable.to_table() has been replaced with scsTab.votable.get_first_table().to_table(), since now astropy.votable presents a nested structure (https://docs.astropy.org/en/stable/io/votable/index.html);
• func__doc has been replaced with doc;
• split has been replaced with str.split;
• string equality condition "is" has been replaced with "==", according to Python warning;
• ConfigParser is called with interpolation=None to avoid crashes when reading urls with %2F symbols

Please let me know if these changes are reasonable, and if you have any question.

Best Regards,
Antonio Iuliano

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