#7372: fix regression in pstats: a previous fix to handle cProfile data in add_callers broke handling of profile data.

#9428: fix running scripts from profile/cProfile with their own name and the right namespace.  Same fix as for trace.py in #1690103.

Revert r83395, it introduces test failures and is not necessary anyway since we now have to nul-terminate the string anyway.

reads on a BZ2File object, rather than returning incorrect results.

where 'id -G' and posix.getgroups() returned the same information,
but one of the sources contains duplicate information. Rewrite the
check using sets instead of lists.

re-initializing a buffered IO object by calling its `__init__` method.

don't cause a crash on Windows.

output with no type specifier failed to match the str output:

  - format(complex(-0.0, 2.0), '-') omitted the real part from the output,
  - format(complex(0.0, 2.0), '-') included a sign and parentheses.

#8826: the "expires" attribute value is a date string with spaces, but apparently not all user-agents put it in quotes.  Handle that as a special case.

#8821: do not rely on Unicode strings being terminated with a \u0000, rather explicitly check range before looking for a second surrogate character.

Small improvements to pstats browser: do not crash on reading invalid file, and actually do a reload when executing "read" as intended.