MiBIG v3.x support

[andrewramsay]

See this issue.

This helper method can cause problems since the v3.x MiBIG JSON format has apparently changed again vs 2.x and 1.x.

So if someone uses the default version (currently still 1.4) and extra BGCs are retrieved separately using download_mibig_bgc_json, it can result in a mix of 1.4 and 3.x formats in the local mibig_json folder.

That then causes an exception in this method because it currently assumes anything that isn't v1.x format must be v2.x.

If support for the MiBIG 3.x JSON format is added to genomics.py it should allow it to handle a mix of different versions.

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It might also be sensible to update the default version from 1.4 to 2.0?

[hechth]

@CunliangGeng I think this is already handled in the development version?

[CunliangGeng]

Yep, this issue is already solved in dev version, the default version of mibig has been updated to latest v3.1.