Adding xsdir to cross_sections.xml conversion

[shimwell]

when trying to run an old mcnp simulation in openmc I guess it would also be handy to have the xsdir converted to a cross_sections.xml

then we can ensure the same nuclear data is used.

this could be a case where the xsdir file is converted but also the ACE file referenced in the xsdir file gets converted to h5 as well

is this xsdir-to-crosssections-xml functionality something that would be well suited to living in this package?

[alberto743]

It should be feasible by considering the xsdir structure, leveraging on available xsdir parser, e.g. PyNE or F4Enix, and the functions available in the openmc.

If this request is still relevant, I may try to propose a tentive converter based on this approach.