Added return value back to deprecated function calls

[joanibal]

Purpose

The return value needs to be passed through the deprecated function calls, because some scripts use the return value.

Type of change

What types of change is it? Select the appropriate type(s) that describe this PR

• [x] 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)

Checklist

Put an x in the boxes that apply.

• [ ] I have run flake8 and black to make sure the code adheres to PEP-8 and is consistently formatted
• [ ] 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

[ewu63]

@joanibal we had restructured the repo recently, so instead of resolving the merge conflict it may be easier to just redo the commit again after pulling the latest changes.

[codecov[bot]]

Codecov Report

Merging #96 (a496665) into master (fd4b04d) will decrease coverage by 9.88%. The diff coverage is 0.00%.

:exclamation: Current head a496665 differs from pull request most recent head b3f5d85. Consider uploading reports for the commit b3f5d85 to get more accurate results

@@            Coverage Diff             @@
##           master      #96      +/-   ##
==========================================
- Coverage   51.12%   41.23%   -9.89%     
==========================================
  Files          38       38              
  Lines        9571     9571              
==========================================
- Hits         4893     3947     -946     
- Misses       4678     5624     +946     

Impacted Files	Coverage Δ
pygeo/parameterization/DVGeo.py	61.76% <0.00%> (-0.37%)	:arrow_down:
pygeo/parameterization/DVGeometryVSP.py	2.90% <0.00%> (-78.13%)	:arrow_down:
pygeo/DVGeometryESP.py	0.00% <0.00%> (-65.49%)	:arrow_down:
pygeo/constraints/areaConstraint.py	52.51% <0.00%> (-26.11%)	:arrow_down:
pygeo/constraints/DVCon.py	58.71% <0.00%> (-3.58%)	:arrow_down:

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