update types in ROSolverOptions

[dpo]

The values of ν and θ should depend on the floating-point type.

@geoffroyleconte @rjbaraldi @MohamedLaghdafHABIBOULLAH Do the values I put in make sense?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (19a26b2) 63.39% compared to head (5446bce) 61.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
- Coverage   63.39%   61.54%   -1.86%     
==========================================
  Files          11       11              
  Lines        1295     1295              
==========================================
- Hits          821      797      -24     
- Misses        474      498      +24     

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[github-actions]

Here are the
demos-results

[MohamedLaghdafHABIBOULLAH]

@dpo , I believe it won't affect the results (as it can be seen in demos_results) that much because in general we use R = Float64, so it will be like 7e^-4. However, I will rerun the numerical experiments for R2N to see if it will change the results.