Patch from Petr Viktorin.

Issue #24317: Makes Customize page default to installing per-user, and switching to All Users enable CompileAll.

For details, see:
PEP 0485 -- A Function for testing approximate equality

Functions added: math.isclose() and cmath.isclose().

Original code by Chris Barker. Patch by Tal Einat.

return True when finding the empty string and the indexes are completely out
of range.

(Merge 3.4)

Initial patch by James Powell.

Refactored timeit.__init__ for unified handling of stmt and setup parameters.

Something went horribly wrong when I was doing `hg rebase`.

PyObject_IsInstance(), PyObject_RichCompareBool() and _PyDict_Contains()
to check for and handle errors correctly.

PyObject_IsInstance(), PyObject_RichCompareBool() and _PyDict_Contains()
to check for and handle errors correctly.