feat: add Hall B pressure timeline

[c-dilks]

Requested by @hauenst

• Adds Hall B pressure, temperature, and humidity
• Fixes EPICS BPM timeline for RG-D, which requires ops MYA deployment instead of history; this is done by first querying ops, and if that fails, it queries history (and if that fails, an exception is thrown)

[c-dilks]

Currently blocked by JeffersonLab/rcdb#101, if we indeed need the run start and stop time to correctly query MYA.

[c-dilks]

myquery will work, following the example of epics_xy.groovy; CI tests will not, so --skip-mya will be used after #140.

We'll need to do something about the ops vs. history decision though...

[c-dilks]

Refactored, centralized myquery usage appears to finally be working. Current online EPICS timelines for RG-D are broken, since the main version of the code uses the history deployment of MYA, rather than ops, so I'm cross checking this PR with #143.

For a few sample runs, the 2H01 y position is not a single Gaussian, and the fits are bad, e.g.,

This is a new, RG-D specific issue, and out of scope of this PR.

The good news is that obtaining the Hall pressure for @hauenst should be relatively straightforward now.