Provide special versions of traceback formatting functions

[agronholm]

Fixes #14.

[coveralls]

Pull Request Test Coverage Report for Build 2943075966

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 235 unchanged lines in 12 files lost coverage.
• Overall coverage decreased (-0.04%) to 74.607%

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Files with Coverage Reduction	New Missed Lines	%
/opt/hostedtoolcache/PyPy/3.8.13/x64/lib/pypy3.8/site-packages/exceptiongroup/init.py	3	80.0%
/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/site-packages/exceptiongroup/init.py	3	80.0%
/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/site-packages/exceptiongroup/init.py	3	80.0%
/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/exceptiongroup/init.py	3	80.0%
/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/site-packages/exceptiongroup/init.py	3	80.0%
/opt/hostedtoolcache/Python/3.11.0-rc.1/x64/lib/python3.11/site-packages/exceptiongroup/init.py	6	60.0%
/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/site-packages/exceptiongroup/_formatting.py	17	88.14%
/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/site-packages/exceptiongroup/_formatting.py	18	87.43%
/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/exceptiongroup/_formatting.py	18	87.57%
/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/site-packages/exceptiongroup/_formatting.py	18	87.57%

Totals
Change from base Build 2862927764:	-0.04%
Covered Lines:	1707
Relevant Lines:	2288

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💛 - Coveralls