Emc2

This release features:

- Option for pre-processing and concatenation of multi-sub-domain output
- Change the `E3SM` model subclass name to `E3SMv1`
- An optional `E3SMv1` input parameter for the inclusion of rain in forward calculations
- Add a single ice option to the `E3SMv1` class in prep for an E3SMv3 subclass
- `E3SMv3` model subclass (contributed by mengz1993)
- Radiation scheme family and microphysics scheme `Model` class attributes
- Refactoring of terminal velocity parameterization selection
- Remove/fix deprecated objects/command

This release features:

- Important bug fixes in hydrometeor allocation (contributed by mengz1993)
- A new option to skip spectral width calculations (contributed by mckenna-stanford)
- Plotting module updates to reflect deprecated matplotlib methods
- Subset feature for DHARMA sub-module
- Removal of Thompson PSD and r_e calculations
- Documentation updates

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.