update to the development release

[Jeremy Faden]

I've made an update to the development release.  This includes a few
bugfixes, like:

* Support for IDL save files containing structures with string arrays,
which were had never been coded properly.  Thanks, Lindsay!
* Excessive checking of units would seriously degrade performance in
some scripts.  Thanks, Bill!
* Jython scripts saved from emails on Macs would have extraneous unicode
non-breaking spaces, which was not handled.  Thanks, Cindy!

and new features:

* Jython editor shows differences, green for added code and blue for
changed, etc.
* aggregation allows files to have hours since midnight and filename
indicates the day.  Thanks, Sadie!
* external changes in the script are automatically loaded into the
editor, without bugging the scientist for confirmation.

These and other changes are described more fully here:
http://autoplot.org/jnlp/20211009b/.  This is the "devel version" at
autoplot.org.

Let me know how things work for you!

Jeremy