I have ported my changes from COAMPS/WW3 (which is v6.07) to my fork, branch "1167-R21B-in-IC4" (which is version 7.14+).
Changes are made to 4 of the WW3 fortran files.'
I needed to do the merge manually, since there are a lot of formatting changes (etc.) going from 6.07 to 7.14.

Adding regtest for IC4M8 and IC4M9
Examples:
cd $REGTESTDIR
./bin/run_test -i input_IC4_M8 -w work_IC4_M8 $MODELDIR ww3_tic1.1
./bin/run_test -i input_IC4_M9 -w work_IC4_M9 $MODELDIR ww3_tic1.1

I also edited the info file.

I did not include ww3_shel.nml for these regtests, since this feature is apparently broken. I did include the other .nml files.
(Specifics about the thing that is broken: the option to have homogeneous input field in ww3_shel.nml. Either it is broken in the code, or it is broken in the examples provided for IC4M1, IC4M2, IC4M3, IC4M4, IC4M5, IC4M7. Regtest IC4M6 *does* run with ww3_shel.nml, since it does not use any homogeneous input field. Failure mode: seg fault)
In any case, regtest with -N with these new regtests will only run if you exclude ww3_shel.nml using -r or -q options of run_test.

Regtests w/out -N *do* work, for all cases.

Merge from develop.
There was a conflict in a single line.
Someone added “,END=801,ERR=802,IOSTAT=IERR” on an IC4-related line.
Conflict resolved by incorporating both edits.

Merge remote-tracking branch 'upstream/develop' into 1167-R21B-in-IC4

Adding IC4M8 and IC4M9 regtests (one each) to matrix.base

…date the documentation in fortran code and regtest to be consistent with naming convention used in the manual (using the 2021a 2021b convention outside the manual is risky because Latex assigns the a and b and it may not be what one has in mind, so I don't use that anymore.)