subscriptions in the MAST API

[ttdu]

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[ttdu]

@snbianco the rest of the notebook is not ready for review, but I wanted to ask about the MissionsMast class defaulting to HST. in this case, when I forgot to set the mission, it tried to download the files and ended up with a lot of nonsense, because the JWST URIs don't work for HST.

what do you think about throwing an error when users don't initialize the mission, instead of defaulting to HST?

[snbianco]

I may be able to do one better. I notice in the subscription JSON that mission is included. I could make it so that AQ uses that value and defaults to the mission attribute if it's not present (and fails gracefully if that doesn't work either). There's a few things I want to finish first, but I should be able to make a PR sometime this sprint.

[ttdu]

calling @snbianco for review!