main: bugfix/exc memleak

[c-randall]

Description

Addresses issue #49, where memory leaks occur when exceptions are raised. The problem seemed to be caused by catching the exception in the AuxData class to re-raise inside other functions. Instead of storing the exception in an object to pass around it is now simply created as a local variable in a new _pyerr_handler() function and re-raised within the error handler.

This fix has also been applied to the v1.1.x branch and v1.1.3 will be released from that branch soon.

Fixes #49

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that improves speed/readability/etc.)
• Bug fix (non-breaking change which fixes an issue)
• Chore (any other clean up, maintenance, etc.)

Key checklist

• No style issues: $ nox -s linter [-- format]
• Code is free of misspellings: $ nox -s codespell [-- write]
• All tests pass: $ nox -s tests
• Badges are updated: $ nox -s badges

Further checks:

• The documentation builds: $ nox -s docs.
• Code is commented, particularly in hard-to-understand areas.
• Tests are added that prove fix is effective or that feature works.