Add configure check for a bug with gcc soft floating-point and subnormals, to help debug issue 8265.

#9279: remove the pdb.doc file, put its contents in pdb.__doc__.  Also sync this and the pdb docs, introduce a new directive for pdb commands and a role to link to them.

char is unsigned.  Thanks Stefan Krah for the patch.

python when they contain instances of old-style classes.

In that case, do not attempt to parse stderr output.

Patch and test by Tony Nelson.

of the random module being around.

while writing bytecode, and importing bytecode with source existing (don't care
about sourceless imports).

if the import lock was disabled.

Issue #2009: refactor varargslist and typedargslist productions to make them more friendly for third-party parsers.