Crashes in Windows

[psb1558]

There are various differences in file handling between Windows and Unix-like systems. I would like to track down any that are causing trouble. One was reported here, but I haven't been able to reproduce this yet. I did get a crash when trying to save and open a temporary file (for the preview), and this is solved by using a better (more recent) temp file method in the xgridfit dependency. (I have updated xgridfit in the repo, but not yet on PyPi.)

Consider this a thread for reporting any crashes in Windows. Report Python version and system version, please.

[psb1558]

One error message that has been coming up in Windows has to do with failure to read the preferences file, which in Unix-like systems is kept in ~/.ygt/ygt_config.yaml. In Windows systems it is better to keep configuration info in the registry, and that is what ygt now does.

So ygt now keeps preferences when run in Windows, and the error message about failure to locate ygt_config.yaml should no longer appear.