Plugged ArgumentsDict into Richards

[JohanMabille]

Mandatory Checklist

Please ensure that the following criteria are met:

• [ ] Title of pull request describes the changes/features
• [ ] Request at least 2 reviewers
• [ ] If new files are being added, the files are no larger than 100kB. Post the file sizes.
• [ ] Code coverage did not decrease. If this is a bug fix, a test should cover that bug fix. If a new feature is added, a test should be made to cover that feature.
• [ ] New features have appropriate documentation strings (readable by sphinx)
• [ ] Contributor has read and agreed with CONTRIBUTING.md and has added themselves to CONTRIBUTORS.md

As a general rule of thumb, try to follow PEP8 guidelines.

Description

[JohanMabille]

@cekees I think this should be the last one. Let me know if I forgot something.

[codecov[bot]]

Codecov Report

Merging #1174 into master will increase coverage by 0.02%. The diff coverage is 48.38%.

@@            Coverage Diff             @@
##           master    #1174      +/-   ##
==========================================
+ Coverage   51.96%   51.99%   +0.02%     
==========================================
  Files         540      540              
  Lines      106714   108250    +1536     
==========================================
+ Hits        55459    56280     +821     
- Misses      51255    51970     +715     

Impacted Files	Coverage Δ
proteus/ADR.py	0.00% <0.00%> (ø)
proteus/mprans/Dissipation.py	9.50% <0.58%> (-2.37%)	:arrow_down:
proteus/mprans/Kappa.py	9.46% <0.60%> (ø)
proteus/mprans/MCorr.py	51.43% <42.98%> (-5.78%)	:arrow_down:
proteus/mprans/MCorr3P.py	50.63% <44.03%> (-3.87%)	:arrow_down:
proteus/mprans/GN_SW2DCV.py	89.87% <100.00%> (+4.55%)	:arrow_up:
proteus/richards/Richards.py	77.16% <100.00%> (+7.11%)	:arrow_up:
proteus/tests/test_boundaryconditions.py	97.33% <0.00%> (-0.13%)	:arrow_down:

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