[Ifeffit] Larch version 2024.12.0

Hi Folks, Larch version 2024.12.0 is now released and ready for download. After many years of version "0.9.something", Mauro convinced me that we should use a date-based version string. This version has many small fixes, with the most important being: - Athena Projects saved by Larch/Larix are now again readable by Athena. - the CIF/XRD/ CIF->Feff conversion code has been moved to a separate project, larixite, where it can be managed separately, and used by Larch/Larix. As usual, much of the work here is from Mauro Rovezzi, and with bug reports and fixes from many people. Hoping everyone has a good winter break, but if analyzing XAS data was on your list of things to get done for the New Year, I hope this helps. Cheers, --Matt