1078 implement gamma distribution model for plus fraction characterization

[Sviatose]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.00000% with 24 lines in your changes missing coverage. Please review.

Project coverage is 36.78%. Comparing base (8b6d456) to head (b79a579).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...sim/thermo/characterization/PlusFractionModel.java	76.04%	16 Missing and 7 partials ⚠️
...a/neqsim/thermo/characterization/Characterise.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1086      +/-   ##
============================================
+ Coverage     36.54%   36.78%   +0.24%     
- Complexity     5653     5697      +44     
============================================
  Files           714      714              
  Lines         71505    71604      +99     
  Branches       8205     8222      +17     
============================================
+ Hits          26130    26341     +211     
+ Misses        43762    43635     -127     
- Partials       1613     1628      +15     

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[EvenSol]

@Sviatose maybe add in test an example of how to modify parameters of the gammamodel?