Warn about non-idempotent values in MFILE

[jonmaddock]

Warn, rather than raise exception, when MFILE variables are non-idempotent (still varying after 10 model evaluations). The variables and their values are put into a table in stdout.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 13.79310% with 25 lines in your changes missing coverage. Please review.

Project coverage is 27.98%. Comparing base (b68ac63) to head (93aeb61).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
process/caller.py	8.33%	22 Missing ⚠️
process/final.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3351      +/-   ##
==========================================
+ Coverage   27.11%   27.98%   +0.86%     
==========================================
  Files          76       76              
  Lines       17736    18881    +1145     
==========================================
+ Hits         4810     5284     +474     
- Misses      12926    13597     +671     

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[jonmaddock]

@j-a-foster @chris-ashe can you check that you can't reproduce this problem any more? I can't seem to reproduce it, but I've imitated it to test this solution.

[j-a-foster]

I've tested two input files on this branch, that fail on main, and they now pass. I can't see the warning in the OUT.DAT though?

[timothy-nunn]

I agree with @j-a-foster that putting this warning and the table in the OUT.DAT (and maybe the MFILE.DAT) could be quite a good idea too.

[jonmaddock]

I've tested two input files on this branch, that fail on main, and they now pass. I can't see the warning in the OUT.DAT though?
Here's the new OUT.DAT output.

# ^Numerics 
   26  TF coil conduit stress upper lim      <  7.5000E+08 Pa           1.1159E+08 Pa        
 
 ****************************************** NON-IDEMPOTENT VARIABLES ******************************************
 
 Model evaluations at the current optimisation parameter vector don't produce idempotent values in the final output.
Variable      Previous value    Current value
----------  ----------------  ---------------
rmajor                     1                8
 
 *************************************** Power Reactor Costs (1990 US$) ***************************************

I've decided not to put anything in the MFILE output, because I don't think it's the right place for error messages.

[timothy-nunn]

Happy with the changes. Curious why there is a warn and print statement each handling half of the out. Maybe consider changing this if its not necessary.

[timothy-nunn]

Why is all of the output not handled by the warn function?

[jonmaddock]

Quite right, I've combined these.