Fix XML distribution flow

[davidorme]

This PR closes #112

• Off topic: the command line tools provided the safedata_zenodo show_resources and safedata_metadata show_resources subcommands, but nothing similar for safedata_validate. This PR removes the subcommands and implements the --show-resources / -s switch across all three commands. This prints the resources to screen and exits.

• The XML system needed more work than I thought. There is a bunch of hardcoded stuff in the XML template that was SAFE Project specific, as well as the stuff that is dataset specific. So:

  • Move all of the hard coded data into a new [xml] section in the Resources configuration.
  • Retool generate_inspire_xml completely - rather than using a huge pile of XPath expressions to find and insert the data, this now uses jinja2 to populate the template much more clearly and easily.
  • Replace the old XML template with a new Jinja template marked up with the locations for the data to be inserted and with some logic to handle missing elements and repeating elements.
  • The docs are now updated to describe the new configuration and to recommend using XML in published datasets.
  • The example usage scripts now include XML generation.

[davidorme]

@jacobcook1995 Apparently something is different in 3.11!

[jacobcook1995]

Oh and also the test failures for python 3.11 look really strange? Like I ran them locally with python 3.11 and everything passed, but on the GitHub runners it seems like literally every test failed

[davidorme]

but on the GitHub runners it seems like literally every test failed

And all in the same way across platforms: ERROR test/test_summary.py::test_core[valid core] - TypeError: expected str, bytes or os.PathLike object, not _GeneratorContextManager

[davidorme]

The issue turned out to be with the importlib.resources.paths method (which is deprecated) and on exactly what gets returned by importlib.resources.files().joinpath(): Traversable not Path, and although Path is compatible, the attributes blah blah blah. It is not an obvious interface.