Updated PF numbering in outputs

[kj5248]

Description

closes #4502

In MFILE.DAT and OUT.DAT there were many places where PF coils were numbered from 0. This has been updated to start from 1.

Also in places such as Volt Second Consumption and Waveforms all the circuits were numbers, the final number has now shows CS as that's what it is. However in the PF Circuit Waveform Data section I left the circuit_var_name as the original as it is a var not an output name.

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 0% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.29%. Comparing base (8fe9306) to head (131ccc6).

Files with missing lines	Patch %	Lines
process/models/pfcoil.py	0.00%	10 Missing ⚠️
process/core/io/plot/summary.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4519      +/-   ##
==========================================
- Coverage   49.30%   49.29%   -0.01%     
==========================================
  Files         150      150              
  Lines       29769    29775       +6     
==========================================
  Hits        14679    14679              
- Misses      15090    15096       +6     

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[chris-ashe]

@kj5248 Have noticed that the coil numbering in the plots now starts from 2. Can you quickly update that to and I will take a full look after