New msmodelutl

[freiburgermsu]

Hello @cshenry !

Here are some minor edits of MSModelUtls:

1. unused import is flagged
   

2. variable definitions are consolidated
   

3. values() is used to simplify loops through dictionaries
   

4. the exchange_list is developed through list comprehension
   

5. generic variable names were clarified
   

6. 1/0 boolean logic, not associated with KBase objects, is replaced with True/False
   

7. arguments that match the default parameters were removed for redundancy
   

8. items() simplified a for loop
   

9. a maximum was determined via max() and list comprehension
   

Thank you :)
Andrew

[freiburgermsu]

I accidentally pulled my main branch into this branch, which consequently updated the PR with my entire repository of commits and changes. I resolved all of the merge conflicts, however, so accepting this PR will not conflict with any changes in your branch.

Andrew