Merge branch '9-update-list-of-bug-fixes-for-4-2-1-release' into 'main'

Resolve "Update with list of bug fixes for 4.2.1 release"

Closes #9

See merge request !4

source/changes.rst

+###################
+Changes since 4.2.0
+###################
+
+List of the main bugfixes in the new 4.2.1 release - March 2023
+
+**KERNEL**
+
+- FCT was not monotonic with non-linear free surface (!191) 
+- Fix emp initial value if salinity relaxation is not used (!221)
+- TKE boundary condition in GLS was wrong with iceshelves cavities (!215)
+- Model initialization in coupled configurations fixed (!151)
+- ABL model was not working with waves options (!144)
+- Spitz 12 configuration namelists have been updated (!175)
+- Bugfix and new diagnostics in OSMOSIS vertical mixing scheme (!172, !168)
+- CPL_OASIS test case has been updated (!111)
+
+**Sea-ice SI3**
+
+- Surface roughness can now be ice-thickness dependant in GLS and TKE scheme (!49)
+- A bug in Rothrock ice strength has been fixed (!139)
+
+**High Performance Computing (HPC)**
+
+- Enable NEMO compilation using single-precision variable (!204) 
+- Fix NEMO compilation when using MPI2 option (!97)
+
+**AGRIF zooms**
+
+- Correct freshwater budget computation when using  AGRIF zooms (!162)
+- Fixed issue with sea surface height (ssh) offset with sea-ice and AGRIF (!128)
+
+**Tracers and biogeochemistry TOP**
+
+- PISCES consolidation and robustness (reproducibility, bugfix corrections, memory optimisation)
+- Revised TOP restart file creation and fix time index when Euler forward time integration is used (!96)
+- Create a common routine to handle bottom boundary layer conditions (trabbl) for both active and passive tracers (!187) 
+- Bugfix on Offline transport in TOP when using  linear surface option (!141)
+- Boundary conditions were missing in 1D configurations with TOP (!103)
+
+- Surface roughness can now be ice-thickness dependant in GLS and TKE scheme (!49)
+- A bug in Rothrock ice strength has been fixed (!139)
+
+**Diagnostics**
+
+- 26/28 isotherm depth calculation fixed (!255)
+- Some dia_ar5_hst outputs were wrong (!140)
+
 ###################
 Changes since 4.0.7
 ###################
 
-List of the main additions to the new 4.2.0 release - February 2022
+List of the main additions to the 4.2.0 release - February 2022
 
-This section is an overview of the major NEMO upgrades as included in the new 4.2.0 release. 
+This section is an overview of the major NEMO upgrades as included in the 4.2.0 release. 
 
 If you are willing to port an existing configuration in order to start using this new release, it is sugggested to also look at the 4.2 `Migration Guide`_ .