Use ldexp(q, exp) instead of q*2.**exp in true division test, to avoid bogus failures on platforms with broken pow (e.g., Ubuntu/ia64).

This is on hosts with multiple ip addresses.

The previous implementation used execv(2) to run the real interpreter, which means that
you cannot use the arch(1) tool to select the architecture you want to use for a
universal build because that only affects the python/pythonw wrapper and not the actual
interpreter.

The new version uses posix_spawnv with a number of OSX-specific options that ensure that
the real interpreter is started using the same CPU architecture as the wrapper, and that
means that 'arch -ppc python' now actually works.

I've also changed the way that the wrapper looks for the framework: it is now linked to
the framework rather than hardcoding the framework path. This should make it easier to
provide pythonw support in tools like virtualenv.

/usr/local by default. Users can still choose to install files into /usr/local, but by
default we'll only install files in /Library/Framework/Python.framework and
/Applications/Python X.Y/

for the machine ("i386" or "ppc"), even if the executable is
64-bit.

This patchs ensures that the distutils platform architecture
represents the architecture for the executable when running a
64-bit only executable on OSX.

for bug report and patch.

pymath.c to Modules/_math.c.

Thanks Case Van Horsen for the patch.

use new-style formatting.  Thanks Florent Xicluna for the patch.

self-test.  Because of a change to the way tracebacks are printed,
this self-test was failing.  The test is run (and passes) during normal
regression testing.  So instead of running the failing self-test this
patch makes doctest emit a usage message.  This is better behavior anyway
since passing in arguments is the real reason to run doctest as a command.

Bug discovery and initial patch by Florent Xicluna.