MPAS-Dev/MPAS-Analysis: v1.2

This update is largely a combination of clean-up and some minor enhancements. The one major analysis task that was added provides vertical profiles of mean T, S and potential density averaged through time and across ocean regions. Major Enhancements Add regional depth profiles #516 Minor Enhancements Allow main vs. ref comparison to use a cached main in addition to a cached ref analysis run #494 Consolidate base directory for diagnostics (obs, mapping and mask files) into one config option #500 Add potential density to WOCE transect plots #498 Clean-up Change reference run to control run #496 Remove code related to deprecated "autoclose" option #501 Make output during setup-and-check phase less verbose #511 Fix PEP8 issues in the whole code #518 Bug fixes Fix unsupported file_cache_maxsize for older xarray #506 Fix handling of missing namelist/streams files #512 Add back missing WOCE transect at Prime Meridian #523 Remove time variables from SSH Obs #52