Emc2

This version includes:

Bug fixes
ACT version compatibility
Documentation update

This includes new statistics (CFADs) as well as generation of lidar scattering ratio and cloud fraction products.

This has some critical fixes to the subcolumn generator.

This version of EMC^2 has several bugfixes and adds support for WRF-NSSL and multiple ice precipitation classes.

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.