Final GEWEX update. Tag 1.6.7 is the most up to date version to use for any GEWEX-related work

CHANGELOG.md

 # Changelog
 
 
+## 1.6.7 (2021-09-20) - Latest version for GEWEX
+
+The versions 1.6.1 through 1.6.6 have not been tracked in the changelog. The 1.6.x code
+is from now on archived and the latest and greatest version (1.6.7 as of Sep, 24th 2021)
+is the reference code to use to create files that use the GEWEX conventions. Here below
+is a list of the features implemented specifically for the project. This list is only
+intended for 1.6.x and, unless otherwise specified, newer versions of Yori will not
+contain any of the feature here listed. The code will be rebased to 1.5.0 and the
+development will continue from there, while keeping the 1.6.x versions "isolated".
+
+### New Features
+- Introduction of new quantities for GEWEX, namely `GEWEX_Mean`,
+  `GEWEX_Standard_Deviation`, `Sum_Mean`, `Sum_Squares_Mean`.
+- a list of hardcoded variables has been included in the aggregation, to account for the
+  fact that variables such as CAE could not be derived directly from L2 data
+- various exceptions were hardcoded in the aggregation part of the code to handle the
+  differences between the CAE* variables and AIWP, ALWP, AIWPH.
+- The `batching` variable has been changed from 2 to 10 in yori_aggregate to attempt to
+  improve performance and memory usage. Future versions of Yori will have this as an
+  option for the user.
+
+
 ## 1.6.0 (2021-04-28)
 
 ### New Features