Various small changes

[A-CGray]

Purpose

• Changes the hard-coded lower bound for the triangulated surface constraint from a dummy value of -1e10 to None which is the correct way to represent that there is no lower bound.
• Converts the SVD vectors computed when using composite DVs from a numpy matrix to a numpy array. Using a matrix causes the design variable values to end up as a 2D array which causes pyoptsparse to fail.
• Fixes a check in addRefAxis that is supposed to evaluate to false is x/y/zFraction is None, but currently also evaluates to False is the values are zero.

Expected time until merged

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.47%. Comparing base (20f491a) to head (1707057).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #241   +/-   ##
=======================================
  Coverage   65.47%   65.47%           
=======================================
  Files          47       47           
  Lines       12265    12265           
=======================================
  Hits         8030     8030           
  Misses       4235     4235           

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