Quick export of phase issues

[briantoby]

Some problems seen with Quick CIF of phase

• - Quick export of phase does not seem to write the selected phase,
• - does not report the directory where it was written on the console and
• - seems to only use the first file name when more than one phase is selected

[AndrewKuncevich]

@briantoby Hello. I would like to take this task. I have already done a small analysis and I have a question. The selected phases should be displayed in one CIF file or in several - one for each phase?

[briantoby]

@AndrewKuncevich Hi Andrew. My thinking is that while a project-based CIF will often have lots of CIF blocks in a single (sometimes huge) file, the quick-CIF should be simple and just have one phase in each file, so part of the task here is to name each file separately.

Note that the relevant code -- I'm pretty sure -- is the routine ExportPhaseCIF.Exporter() in file exports/G2export_CIF.py. At the moment I am questioning my sanity in tagging this as a "good 1st issue" in that it probably will require looking through a bunch of parent classes. Note that class ExportCIF is defined in exports/G2export_CIF.py from GSASIIfiles.ExportBaseclass. I don't think that anything in ExportBaseclass will need to be changed.

Please do ask for help if anything seems hard to follow (if so, my fault). BTW, my first step working on this would be to run the Exporter() code in a debugger (like Spyder or VSCode) to see what the upper-level routine is doing. Or possibly stick in some print statements.

[AndrewKuncevich]

PR - #209