Saving TDB with A*(B+C) expressions

[nury12n]

This is a minor fix to an issue I was having when saving a Database to a TDB file.

If the TDB had a parameter with the expression A*(B+C) it would get saved as A*B+C, removing the parenthesis around the Add expression.

Changes

• When stringify-ing expressions through TCPrinter and the expression is a Mul object, this checks if the arguments in Mul is an Add object and explicitly adds parenthesis if it is.
• Refactoring the elif block that processes the Mul object, since all arguments in the Mul object can be treated the same and joined together.
• Tests for ensuring that parenthesis around Add expressions are retained and that parentheses are not unnecessarily added when the argument in Mul is not Add.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.48%. Comparing base (716d923) to head (650e85e).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #522      +/-   ##
===========================================
+ Coverage    90.46%   90.48%   +0.01%     
===========================================
  Files           50       50              
  Lines         7868     7880      +12     
===========================================
+ Hits          7118     7130      +12     
  Misses         750      750              

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