#830 filePollUpdates reboot

[Jeremy Faden]

Scott asked if Autoplot could automatically reread files when they are updated, and it's actually had this ability since before RBSP launch. This is not advertised, though, even in completions. There should be an example of its use and also a demo in the github "dev" example Jython scripts. Last, Autoplot was so buggy back then that it's likely there's clean-up which wasn't done (such as deleting the thread if the data source is reset).

[Jeremy Faden]

Also a data source has additional capabilities now, and I see that there is an UpdatingCapability. This might be a cleaner way of implementing the feature.

[Jeremy Faden]

The URI

file:///home/jbf/project/voyager/vg1pws_lr_20240519_v5.30.cdf?electric_field&filePollUpdates=10 

checks for file updates every ten seconds.