I cahnged the call from IRISFactory to FDSNFactory in data.py, updated the validator in DataAPIQuery.py to accept Variometer IDs, added a new file called variometers.py so that the ASL_Observatory_index can be used by the webservice, and this includes a change to app.py where I added a router to the new variometers.py script. I opted to not change any of the file names currently, but will give this some more thought. I wanted to commit these chagnes soon so that Nick can begin working on the front end.

We can't totally obscure things and fairly call this an "open" api.
However, if we prefer to limit experimentation by novice developers,
it seems prudent to at least partially obscure some options in the
user-friendly Swagger for our api. This seemed especially important
for the data_host option, which could be susceptible to abuse. So,
all models/schemas are published via `ws/openapi.json`, but only
"default" options are displayed on the Swagger page's "Try it out"
section.

Allows the user to specify an alternate host to pull time series
data from via the URL. This is mostly useful for using the data
web service to test different verified data sources. It is not
really a "public" feature, and we might consider how to restrict
its deployment to non-public servers only.

update get_data's usage of get_data_factory