added export_variables options, updated docs.

[kthyng]

Also access to outname_file.

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (135d03b) 67.22% compared to head (98f516f) 67.21%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...acking_manager/models/opendrift/model_opendrift.py	66.66%	3 Missing ⚠️
particle_tracking_manager/the_manager.py	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   67.22%   67.21%   -0.02%     
==========================================
  Files          14       14              
  Lines         952      970      +18     
==========================================
+ Hits          640      652      +12     
- Misses        312      318       +6     

Flag	Coverage Δ
unittests	67.21% <68.42%> (-0.02%)	⬇️

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