Emc2

We have released EMC^2 v.1.2.

**Significant updates: Main highlights are E3SM and CESM2 support, regional domain output treatment, and CSAPR support**

In addition to several more minor fixes and added features:
- Several bug fixes and adding a radar detectability mask
- Corrections to some strings printed on string during plotting method processing
- Important 'total' variable calculation fixes
- Treatment of regional output for plotting (cropping without stepping over the full dataset)
- Added the parallel and chunk options in main module
- Added parallelism to subcolumn allocation task
- Added a dim permutation method for EMC^2 consistency (especially with regional output)

This includes fixes to the online documentation as well as a new feature for plotting the gate mask.

This is the first official release of EMC^2. Additions to this version include two new techniques for calculating the forward simulated parameters as well as various bugfixes and code restructuring.

We have again made several bugfixes to the spectral width calculation in addition to enhancements to the plotting subroutines.

This release of EMC^2 fixes several issues in the radar and lidar moment calculations. In addition, there is now a way to visualize subcolumn results using a SubcolumnDisplay object.