Fix variable names cut off in MFile

[timothy-nunn]

Closes #3427

Makes the entire output interface in Python which often just calls the underlying Fortran function.

There is a Python implementation of the ovarre, ocosts, and ovarrf functions, with the latter two using the former. This will cause a slight change in the OUT.DAT which won't have 1.234F5 style variables, instead 1.234e5.

The Fortran implementations of ocosts and ovarrf are removed. ovarre's Fortran implementation can be removed in the scan conversion #3526.

new_large_tokamak_nof.MFILE.DAT.txt
new_large_tokamak_nof.OUT.DAT.txt
old_large_tokamak_nof.MFILE.DAT.txt
old_large_tokamak_nof.OUT.DAT.txt

new_large_tokamak_once_through.MFILE.DAT.txt
new_large_tokamak_once_through.OUT.DAT.txt
old_large_tokamak_once_through.MFILE.DAT.txt
old_large_tokamak_once_through.OUT.DAT.txt

By eye, some of these have more decimal places but @jonmaddock please double check this still respects your 17 sig fig changes.

This also changes the cost output from

(c211)              Site improvements, facilities, land (M$)                                                     35.20

to

Site improvements, facilities, land (M$)                                (c211)                        3.52000000000000028e+01

I also corrected some namespaced outputs that I found along the way e.g. physics_variables.rmajor. to rmajor.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.68085% with 5 lines in your changes missing coverage. Please review.

Project coverage is 31.40%. Comparing base (b61a1c5) to head (43775ff).

Files with missing lines	Patch %	Lines
process/process_output.py	87.50%	4 Missing ⚠️
process/init.py	97.43%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3531      +/-   ##
==========================================
+ Coverage   31.31%   31.40%   +0.09%     
==========================================
  Files          81       82       +1     
  Lines       19515    19548      +33     
==========================================
+ Hits         6111     6140      +29     
- Misses      13404    13408       +4     

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[chris-ashe]

Happy with the truncation removal. Some variables are not aligned properly but this can be fixed later