Port MY_SRC* 4.0.4 to 4.2.1

[jdha]

Work through the following to port from 4.0.4 to 4.2.1:

These are currently in various different MY_SRC directories:

MY_SRC_GO8_FROZEN

• [ ] diaprod.F90 not porting as code as not used
• [ ] domain.F90 _not porting as code overwritten by MYSRC
• [ ] icb*.F90 not porting as code has advanced
• [ ] ice*.F90 not porting as code has advanced
• [ ] iom.F90 _not porting as code overwritten by MYSRC
• [x] restart.F90
• [ ] step.F90 not porting as code on mod is for diaprod
• [ ] zdfmxl.F90 not porting as code change linked to zdftmx
• [ ] zdfphy.F90 not porting as code change linked to zdftmx
• [ ] zdftmx.F90 not porting as old 3.6 code
• [x] diawri.F90
• [x] dommsk.F90
• [ ] in_out_manager.F90 _not porting as code overwritten by MYSRC
• [x] ldftra.F90
• [ ] sbcssm.F90 _not porting as code overwritten by MY_SRCRIV
• [ ] step_oce.F90 not porting as code on mod is for diaprod
• [ ] zdf_oce.F90 not porting as code change linked to zdftmx
• [x] zdftke.F90

MY_SRC

• [x] #131
• [x] domain.F90
• [x] dtatsd.F90
• [ ] dynhpg.F90 not porting as DJC code now in 4.2.1
• [x] in_out_manager.F90
• [x] iom.F90
• [x] istate.F90
• [x] par_oce.F90
• [ ] sbcrnf.F90 _not porting as code overwritten by MY_SRCRIV
• [x] traqsr.F90
• [ ] zdfgls.F90 not porting as mxlice code now in 4.2.1

MY_SRC_TIDE

• [ ] dynspg_ts.F90 not porting as @jasontempestholt to update
• [ ] sbctide.F90 _not present in 4.2.1 some of this now resides in tidemod.F90
• [ ] tide.h90 not porting as code now in 4.2.1 using #ifndef TIDE_VAR_0
• [ ] tideini.F90 _not present in 4.2.1 this now resides in tidemod.F90
• [ ] tide_mod.F90 not porting as @jasontempestholt to update

MY_SRC_RIV

• [x] sbc_oce.F90
• [x] sbcrnf.F90
• [x] sbcssm.F90

Currently the copy order in the setup script is:

1. MY_SRC_GO8_FROZEN
2. MY_SRC
3. MY_SRC_TIDE
4. MY_SRC_RIV

Once ported code will be held in a single MY_SRC directory.