update to main 20240228 commit

This patch clears out many errors detected by Intel Fortran.

Most are false positives from stub functions which would normally be
replaced in production and report unset output.  These variables are now
assigned dummy values in order to pacify the compiler.

The `stat` function in POSIX was incorrectly passing its `buf` object to
the C `stat` function as `intent(in)`, causing the compiler to believe
that the contents were unset.  Oddly, this was already working
correctly, and perhaps warrants further investigation, but it has now
been correctly set to `intent(inout)`.

The `ppoly_*` variables in `check_reconstruction_1d` appear to have been
incorrectly declared as `out`, when they are clearly used as `in` to
validate the values.  This has been corrected.

`register_diag_field` in the ice shelf diag manager was incorrectly
declared and the function appeared to return nothing.  Perhaps this
function was not used for anything.

An IO statement in MOM_open_boundary had a syntax error; this has been
fixed.

`get_dataset` returns a `dataset_type`, so some compilers expect the
stub function to also return a valid `dataset`.  Since the stub
`dataset_type` contains no fields, any locally declared instance should
be sufficient as a return value.

Error cleanup (Intel Fortran)

…20240401

update to MOM6 main repo 20240401 commit

The default values for the database transfer functions were incorrectly
assiged as integer literals, recast to types using real32/64 but
actually corresponding to whatever integer kind equals real32/64.

We now simply assign it a literal value of -1. and rely on the compiler
to handle the recasting.

Although none of these functions were intended to be used, and -1 would
probably be eventually cast into an appropriate real type, it is better
to get this correct.

Thanks to Keith Lindsay for suggesting this change.

Replace db array default values with real literals

…0240425

remove compiling warning