Make dummy PV limit data more realistic

[ptsOSL]

• Magnet limits are taken from current magnet power supplies spreadsheet
• I had to modify the QUAD lower limits to allow negative currents even though these power supplies are unipolar. I believe this issue is caused by the polarity of the MML physics values being correct.
• BPM limits are the same as for D2
• RF limits were made to vary 20KHz around the ideal theoretical value. For D1 they varied 10KHz around a different ideal theoretical value.
• The remaining values were set to sensible estimates based on my knowledge of our systems. These values aren't currently important, so it is okay if they are approximate. If they become important later, they may need to be adjusted then.

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 25.11%. Comparing base (d23dc13) to head (56ac7c4).

Files with missing lines	Patch %	Lines
src/virtac/create_csv.py	14.28%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
- Coverage   25.30%   25.11%   -0.20%     
==========================================
  Files           5        5              
  Lines         648      661      +13     
==========================================
+ Hits          164      166       +2     
- Misses        484      495      +11     

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