specify UA for multi stream HX

[EvenSol]

makes it possible to specify overall UA value of a multi stream HX. Method is not optimized for seed and ropbustnes, but works for test case.

src/test/java/neqsim/process/equipment/heatexchanger/MultiStreamHeatExchangerTest.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.43478% with 9 lines in your changes missing coverage. Please review.

Project coverage is 41.01%. Comparing base (6cd2f4c) to head (1c198a4).

Files with missing lines	Patch %	Lines
...ipment/heatexchanger/MultiStreamHeatExchanger.java	80.43%	3 Missing and 6 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1231      +/-   ##
============================================
+ Coverage     40.98%   41.01%   +0.03%     
- Complexity     5988     5995       +7     
============================================
  Files           719      719              
  Lines         68273    68319      +46     
  Branches       8163     8171       +8     
============================================
+ Hits          27983    28024      +41     
+ Misses        38604    38603       -1     
- Partials       1686     1692       +6     

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