Add awareness of default/released products to VV saving

Previously, the most recent products were marked "most_recent" in the
VV HDF5 table.  Now the default/released products will have isdefault
set.
Add options to make many single VV slot plots

Add a "singles" option to vv.plot_slot to have it spit out separate
figures instead of the one figure with 5 plots.
Only save the vv slot if there are data samples
Handle VV default state as an object property
Improve mica.vv obspar handling

Determine the obspar version that was used during aspect processing,
and then try to use that obspar or update the archive to include it if
isn't already in the archive.
Store vv default status as 0 or 1.
VV whitespace and formatting fixes
Add mica.vv.update() routine

Process new obsids that have been ingested in mica.archive.asp_l1.
Break vv plot and data saving to a separate method

This saves the annoyance of watching the tool save out images when
attempting to run in an interactive fashion to do manual VV checking.
Add get_vv routing to fetch/load JSON and images

This is the beginning of a access method for already-processed data
Add update and get_vv to vv/__init__.py
Explicitly exclude vv slot from h5 if no data