_importer.py issues

[cgroeneveld]

Currently, I'm trying to use parmdb2h5parm, which relies on _importer.py (in particular, it needs create_h5parm). However, there are several issues with parmdb2h5parm: it uses progressbar, which relies on a broken implementation of an abstract base class; there are some syntax errors (in particular, regex is used but never imported, caused by #10309757420c11a342ae1a8f9a43d204ac097b51).

Perhaps we can isolate and implement create_h5parm in parmdb2h5parm instead, so we do not need to rely on _importer.py?

[revoltek]

That was indeed added by users at a certain point for specific tests, it is rarely used and I agree it should be very much cleaned up...

[cgroeneveld]

It might be necessary to rewrite create_h5parm as well, as I am running into several other bugs as well (unhashable type: list, for example)