[docs] [issue22014] Improve display of OS exception <-> errno mapping

[Jon Poler]

Jon Poler added the comment:

Here's one way to accomplish this. Please see attached os_exceptions_table_V2.patch.

I wasn't having much luck trying to use ReST, so I took advantage of the fact that the Doc/conf.py file is executed every time sphinx-build is run. conf.py imports and calls the main function from Doc/tools/build_table.py. This script dynamically builds a table by scraping errno values corresponding to an OS exception and inserting them in the appropriate place. Doc/library/exceptions.rst just uses a literalinclude of the new table that gets built to Lib/test/os_exception_hierarchy.txt (the same directory that holds the original exceptions hierarchy).

Error catching is used so that, in the event of an error, a warning will be raised but the sphinx-build command will still succeed.

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Added file: http://bugs.python.org/file36392/os_exceptions_table_V2.patch

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