Hotfix builder issue #70

[sleigh2022]

• Fixes issue Builder associateOnCreation bug #70 and adds to existing tests.
• Coverage of individual common_variables functions (density etc.) to revisit later.

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.16%. Comparing base (091390a) to head (7e4ef89).
⚠️ Report is 6 commits behind head on dev-v2.0.1.

Files with missing lines	Patch %	Lines
RMK_support/common_variables.py	42.86%	16 Missing ⚠️
RMK_support/tests/test_common_variables.py	93.75%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           dev-v2.0.1      #71      +/-   ##
==============================================
- Coverage       88.71%   88.16%   -0.54%     
==============================================
  Files              33       33              
  Lines            7603     7630      +27     
==============================================
- Hits             6744     6726      -18     
- Misses            859      904      +45     

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[SMijin]

Test pass, all looks good, merging.