Improve data file release engineering

[mperrin]

Some ideas:

• [x] Update the scripts in dev_utils to work on Central Store and from e.g. telservN, rather than assuming it's being ran on some local Mac (with paths to /tmp that don't work on Linux on telserv)
• [ ] ~~Save the output zip files to /itar/jwst/tel/share/webbpsf ? (Or, maybe don't do this automatically because we don't want to store them there until we are sure things are working as desired?).~~ Update: no longer desired. Eventually we move files onto a public Box folder now, which is done by hand
• [ ] ~~Put the downloads in some team-writable area rather than just in Marshall's home directory.~~ See prior comment. Box used now.
• [ ] Automate the part where it unzips the new file, set the environment variable for WEBBPSF_PATH appropriately, and runs all the tests.
• [ ] Put version number in minimal data zip file too

[mperrin]

Partly done in #454