Upgrade to MAPL-2.1
Zero-diff to previous release: YES
Restart Changes: NO
Major changes are:
- Update to MAPL 2.1 which includes both fixes from MAPL v2.1.0 and MAPL v2.1.1
- With this is included updating to latest releases of ESMA_env and ESMA_cmake needed by MAPL 2.1
- Add monthly mean features.
- Add optional equation of time correction to solar position used to calculate solar zenith angle.