Fix SNOPT printout encoding and skip printing import warnings

[ewu63]

Purpose

Closes #379.
Turns out we just forgot to initialize the cw array to " ". Also can get rid of cdummy now.

Also cleaned up import warnings for compiled libraries -- they are now no longer printed by default at import time for non-default libraries.

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

Attention: Patch coverage is 7.69231% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 61.66%. Comparing base (ab1618f) to head (73848dd).

Files	Patch %	Lines
pyoptsparse/pySNOPT/pySNOPT.py	0.00%	4 Missing ⚠️
pyoptsparse/pyOpt_utils.py	33.33%	2 Missing ⚠️
pyoptsparse/pyCONMIN/pyCONMIN.py	0.00%	1 Missing ⚠️
pyoptsparse/pyNSGA2/pyNSGA2.py	0.00%	1 Missing ⚠️
pyoptsparse/pyOpt_constraint.py	0.00%	1 Missing ⚠️
pyoptsparse/pyOpt_gradient.py	0.00%	1 Missing ⚠️
pyoptsparse/pyOpt_optimization.py	0.00%	1 Missing ⚠️
pyoptsparse/pySLSQP/pySLSQP.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #392       +/-   ##
===========================================
- Coverage   73.75%   61.66%   -12.10%     
===========================================
  Files          22       22               
  Lines        3296     3292        -4     
===========================================
- Hits         2431     2030      -401     
- Misses        865     1262      +397     

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[ewu63]

bump @sseraj @lamkina

[marcomangano]

Can you update the PR title/description to mention the new flag? I am also not sure if this is the way to go, see below.
The cw update is good stuff!

[marcomangano]

What are the scenarios where we don't want to raise a warning when the import fails? Even if it's from THIS_DIR we should probably raise an error

[ewu63]

Right now on the main branch, running e.g. example/hs015.py will emit the following warnings for me:

.../pyoptsparse/pyoptsparse/pyIPOPT/pyIPOPT.py:28: UserWarning: pyipoptcore module could not be imported from .../repos/pyoptsparse/pyoptsparse/pyIPOPT.
  pyipoptcore = try_import_compiled_module_from_path("pyipoptcore", THIS_DIR)
.../pyoptsparse/pyoptsparse/pyNLPQLP/pyNLPQLP.py:20: UserWarning: nlpqlp module could not be imported from .../pyoptsparse/pyoptsparse/pyNLPQLP.
  nlpqlp = try_import_compiled_module_from_path("nlpqlp", THIS_DIR)

Without the changes in this PR, we always print warnings (at import time) if we cannot import these libraries. Given that they are optional and not installed by pyOptSparse, I don't think we will want this for end users. The PR changes this behaviour so that warnings are not emitted by default. Note that errors are raised at instantiation time if import fails and this PR does not change that behaviour.

[marcomangano]

LGTM, reverted the version change because we should wait for #394 before the next release #388 will trigger a minor version update

[sseraj]

I can confirm that this fixes the non-UTF8 characters in the SNOPT print file. The import changes also look good.