Poincare options

[ejpaul]

The PR adds a few more keyword arguments for Poincare plotting. With the default option, the marker size can sometimes be too large to see details of the plot.

[codecov]

Codecov Report

Attention: 120 lines in your changes are missing coverage. Please review.

Comparison is base (705053a) 90.66% compared to head (51b37b4) 91.46%.
Report is 474 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #362      +/-   ##
==========================================
+ Coverage   90.66%   91.46%   +0.80%     
==========================================
  Files          65       72       +7     
  Lines       11030    12825    +1795     
==========================================
+ Hits        10000    11730    +1730     
- Misses       1030     1095      +65     

Flag	Coverage Δ
unittests	91.46% <93.58%> (+0.80%)	⬆️

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Files	Coverage Δ
src/simsopt/_core/__init__.py	100.00% <100.00%> (ø)
src/simsopt/_core/derivative.py	98.90% <100.00%> (ø)
src/simsopt/_core/finite_difference.py	94.06% <100.00%> (+0.90%)	⬆️
src/simsopt/_core/json.py	83.67% <100.00%> (+0.59%)	⬆️
src/simsopt/_core/optimizable.py	90.35% <100.00%> (+0.19%)	⬆️
src/simsopt/field/__init__.py	100.00% <100.00%> (ø)
src/simsopt/field/biotsavart.py	95.52% <100.00%> (-0.04%)	⬇️
src/simsopt/field/magneticfield.py	99.27% <100.00%> (+0.13%)	⬆️
src/simsopt/field/magneticfieldclasses.py	97.35% <100.00%> (+1.34%)	⬆️
src/simsopt/field/normal_field.py	92.20% <100.00%> (+2.59%)	⬆️
... and 35 more

... and 5 files with indirect coverage changes

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