ChimeraX fetched data deleted by Mac OS upgrade

[Tom Goddard]

Upgrading Mac OS from 10.12 to 10.12.1 apparently deleted ~/Library/Caches/ChimeraX (and all other Caches directories I suspect). Same thing happened upgrading from Mac OS 10.11 to 10.12.

Unfortunately this means the hundreds of files I fetched from PDB and EMDB are gone, my entire ChimeraX open file history is gone. It seems we are putting these files in a directory Mac OS considers transient. Maybe they instead belong in ~/Library/Application Support/ChimeraX.

[Greg Couch]

We have several directories that ChimeraX can save data in via the AppDirs objects, chimerax.app_dirs and chimerax.app_dirs_unversioned. The user's data directory, configuration directory, and cache directory. On the Mac, they are ~/Library/Application Support/ChimeraX/0.1, ~/Library/Application Support/ChimeraX/0.1, and ~/Library/Caches/ChimeraX/0.1. We need to review what goes where.

[Greg Couch]

The fetched data location was moved ton ~/Downloads/Chimerax/