Add MFILE support and update zeff variable in EBW/ECRH coupling graph…

[chris-ashe]

… plotting

Description

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 45.98%. Comparing base (1448faf) to head (bc17a4e).

Files with missing lines	Patch %	Lines
process/current_drive.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4005   +/-   ##
=======================================
  Coverage   45.98%   45.98%           
=======================================
  Files         123      123           
  Lines       29001    29003    +2     
=======================================
+ Hits        13337    13338    +1     
- Misses      15664    15665    +1     

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[j-a-foster]

Happy with changes.