Add Release Notes for GFSv16.1

Added the file docs/Release_Notes.gfs.v16.1.0.txt to release branch
release/gfsv16.1.

Refs: #301

docs/Release_Notes.gfs.v16.1.0.txt

@@ -0,0 +1,145 @@
+GFS V16.1.0 RELEASE NOTES
+
+
+PRELUDE
+
+  NOAA awarded Delivery Order 2 (DO-2) of its commercial radio occultation (RO) 
+  data purchase to GeoOptics on February 19, 2021.  This purchase covers 1300 
+  occultations a day over a six month period with the data flow starting on 
+  March 17, 2021.
+
+  The quality of the GeoOptics occultations was examined during Delivery 
+  Order 1 (DO-1) in December 2020 and January 2021.  Forecast impact assessment
+  was conducted using half resolution parallels in the GFSv16 framework.
+
+  Testing of the DO-2 data is being carried out using a real time full 
+  resolution parallel, v161rt1.  It was initially started in mid-February 
+  to test reproducibility with the GFSv16 NCO parallel, then adjusted to reduce
+  computational footprint.  Data from GeoOptics began to be assimilated as soon 
+  as it was available on March 17.  Configuration for the use of the commercial
+  data was informed by the results of DO-1 experimentation, with the quality 
+  control and observation errors being treated as other RO data with the 
+  exception of lowering the upper bound of data.
+
+  This package also addresses several GFS v16 bugzilla tickets.  GFS v16 
+  bugzilla tickets #1196 and #1205 are resolved in this package.   The error 
+  reported in bugzilla ticket #1206 has been documented to be compiler, not 
+  code, specific.  The DA aspect of GFS v16 bugzilla tickets #216, #1198, #1218,
+  #1221, and #1222 are also addressed by this package.  None of the DA 
+  bugzilla changes alter analysis results.
+
+  GFSv16 introduced a bug where the sign of the layer height (delz) increment 
+  was flipped.  The included bugfix reverts the sign as originally intended.  
+  This fix was tested in both a low resolution setting and with a full 
+  resolution parallel, v16rt2c.  Once v16rt2c was seen as viable, it also 
+  began assimilating the GeoOptics data so both changes were tested in one 
+  package.
+
+
+IMPLEMENTATION INSTRUCTIONS
+
+  The NOAA VLab and both the NOAA-EMC and NCAR organization spaces on GitHub.com 
+  are used to manage the GFS.v16.1 code. The SPA(s) handling the GFS.v16.1 
+  implementation need to have permissions to clone VLab gerrit repositories and 
+  the private NCAR UPP_GTG repository. All NOAA-EMC organization repositories are 
+  publicly readable and do not require access permissions.  Please follow the 
+  following steps to install the package on WCOSS-Dell:
+
+  1) cd $NWROOTp3
+
+  2) mkdir gfs.v16.1.0
+
+  3) cd gfs.v16.1.0
+
+  4) git clone -b EMC-v16.1.0  https://github.com/NOAA-EMC/global-workflow.git .
+
+  5) cd sorc
+
+  6) ./checkout.sh -o
+     * This script extracts the following GFS components:
+         MODEL     tag GFS.v16.0.16                  Jun.Wang@noaa.gov
+         GSI       tag gfsda.v16.1.0                 Russ.Treadon@noaa.gov
+         GLDAS     tag gldas_gfsv16_release.v1.12.0  Helin.Wei@noaa.gov
+         UFS_UTILS tag ops-gfsv16.0.0                George.Gayno@noaa.gov
+         POST      tag upp_gfsv16_release.v1.1.3     Wen.Meng@noaa.gov
+         WAFS      tag gfs_wafs.v6.0.21              Yali.Mao@noaa.gov
+
+  7) ./build_all.sh
+     * This script compiles all GFS components. Runtime output from the build for 
+       each package is written to log files in directory logs. To build an 
+       individual program, for instance, gsi, use build_gsi.sh.
+
+  8) ./link_fv3gfs.sh nco dell	
+
+
+SORC CHANGES
+
+* sorc/
+  * checkout.sh will checkout the following changed model tags:
+    * GSI; tag gfsda.v16.1.0 - See release notes 
+      doc/Release_Notes.gfsda.v16.1.0.txt in the GSI tag for details.
+
+    * POST; tag upp_gfsv16_release.v1.1.3 - There are no changes in this tag 
+      compared to operations.  The tag number was updated from 
+      tag upp_gfsv16_release.v1.1.1 to incorporate the local changes made 
+      in operations.
+
+    * WAFS; tag gfs_wafs.v6.0.21 - There are no changes in this tag compared to 
+      operations.  The tag number was updated from gfs_wafs.v6.0.17 to 
+      incorporate the local changes made in operations.
+
+
+JOBS CHANGES
+
+* No change from GFS v16.0
+
+
+FIX CHANGES
+
+* The contents of fix/fix_gsi have been updated.  See release notes 
+  doc/Release_Notes.gfsda.v16.1.0.txt in the NOAA-EMC/GSI tag gfsda.v16.1.0 
+  for details.
+
+
+RESOURCE INFORMATION
+
+* No change from GFS v16.0 in terms of modules, computational resources, 
+  run time, or disk space.
+
+
+PRE-IMPLEMENTATION TESTING REQUIREMENTS
+
+* Which production jobs should be tested as part of this implementation?
+  * The entire GFS v16.1 package needs to be installed and tested. 
+
+* Does this change require a 30-day evaluation?
+  * No.
+
+
+DISSEMINATION INFORMATION
+
+* Where should this output be sent?
+  * No change from GFS v16.0
+
+* Who are the users?
+  * No change from GFS v16.0
+
+* Which output files should be transferred from PROD WCOSS to DEV WCOSS?
+  * No change from GFS v16.0
+
+* Directory changes
+  * No change from GFS v16.0
+
+* File changes
+  * No change from GFS v16.0
+
+
+HPSS ARCHIVE
+
+* No change from GFS v16.0
+
+
+JOB DEPENDENCIES AND FLOW DIAGRAM
+
+* No change from GFS v16.0
+