End DynamicCadence through the GUI

[griffin-h]

Is your feature request related to a problem? Please describe.
I can't find a way to end a DynamicCadence through the TOM GUI. I can only do it on the command line by setting dc.active = False. Canceling an individual ObservationRequest associated with the DynamicCadence does not deactivate its parent.

Describe the solution you'd like
There are two options and I'm not sure which (or both) is preferable:

1. Create a page listing all active DynamicCadence objects with the ability to edit or cancel them. (This would be very similar to the "scheduling" page on the Supernova Exchange.)
2. Any time you cancel an ObservationRequest that came from a DynamicCadence, set the parent DynamicCadence to inactive. (The Supernova Exchange also works this way. You cannot just cancel one of a series of requests.)

Additional context
It's possible there is a way to do this and I just haven't found it. If so, this issue should just be to update the documentation.

[jchate6]

I think the only way to do this from the UI would be through the admin interface.
Do you need more access for non-admin users?

[griffin-h]

Yes, we would want normal users to be able to edit/cancel their observing sequence requests.

[phycodurus]

see also #1069