Post release 3.6.0 reset

[wpbonelli]

Merge master back to develop, update version numbers, touch up changelog

[codecov]

Codecov Report

Attention: 99 lines in your changes are missing coverage. Please review.

Comparison is base (879c153) 72.8% compared to head (6c5ec50) 68.4%.
Report is 47 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #2100     +/-   ##
=========================================
- Coverage     72.8%   68.4%   -4.5%     
=========================================
  Files          259     259             
  Lines        59040   57835   -1205     
=========================================
- Hits         43004   39576   -3428     
- Misses       16036   18259   +2223     

Files	Coverage Δ
flopy/__init__.py	100.0% <ø> (ø)
flopy/export/netcdf.py	48.6% <100.0%> (-0.7%)	⬇️
flopy/export/shapefile_utils.py	81.8% <ø> (-2.0%)	⬇️
flopy/mbase.py	69.3% <100.0%> (-0.6%)	⬇️
flopy/mf6/coordinates/modeldimensions.py	74.2% <ø> (-4.8%)	⬇️
flopy/mf6/data/mfdataplist.py	73.9% <100.0%> (-2.4%)	⬇️
flopy/mf6/data/mfdatascalar.py	59.4% <ø> (-1.1%)	⬇️
flopy/mf6/data/mfdatastorage.py	67.7% <100.0%> (-2.1%)	⬇️
flopy/mf6/data/mffileaccess.py	70.8% <100.0%> (-0.5%)	⬇️
flopy/mf6/mfbase.py	74.7% <ø> (-6.9%)	⬇️
... and 155 more

... and 43 files with indirect coverage changes