rpointers update from escomp

updates to cice6_5_0_20240702

always send Si_thick to mediator

Merge branch 'CICE-Consortium:main' into cesm_updates

Merge branch 'CICE-Consortium:main' into cesm_updates

Merge branch 'CICE-Consortium:main' into cesm_updates

Add time_period_freq to history file metadata

Merge branch 'CICE-Consortium:main' into cesm_updates

Update version to CICE 6.4.1 (CICE-Consortium#803)

Update Icepack to latest release version
Remove trailing blank space

Update stress12T calculation for C-grid (CICE-Consortium#802)

* Update stress12T calculation for C-grid

stress12T was zero.  Compute stress12T in subroutine stressC_T after computing estimate of shearT by averaging shearU.

minor updates to some indentation and variable names.

* Update calc of stress12T and shearT for C-grid for performance, changes answers