Additional hardware description overlays

[eldond]

• Add plots methods for the following hardware systems:
  • Langmuir probes
• Add more sample data for probes
• Improve sample data for other overlays
• Corresponds with https://github.com/gafusion/OMFIT-source/pull/4196, which adds scripts for writing hardware descriptions to ODS
• Other developments:
  • Avoid illegal string warnings in python3 (mostly making some docstrings into raw strings)
  • Add system for controlling alignment of text labels by adding new standard plot_overlay keywords label_ha and label_va

[codecov[bot]]

Codecov Report

Merging #82 into master will increase coverage by 1.11%. The diff coverage is 97.26%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   76.96%   78.07%   +1.11%     
==========================================
  Files          24       24              
  Lines        6051     6341     +290     
==========================================
+ Hits         4657     4951     +294     
+ Misses       1394     1390       -4

Impacted Files	Coverage Δ
omas/omas_core.py	82% <ø> (ø)	:arrow_up:
omas/tests/test_omas_plot.py	98.54% <100%> (+0.38%)	:arrow_up:
omas/omas_sample.py	100% <100%> (ø)	:arrow_up:
omas/omas_utils.py	77.61% <80%> (ø)	:arrow_up:
omas/omas_plot.py	89.88% <96.09%> (+3.27%)	:arrow_up:

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[eldond]

@orso82 I think this is ready to merge.