This is just a placeholder patch related to PEP 304.  Feel free to
comment on it.  It's far from complete at this point.  The first
patch is just to see if we can do all the proper detection at
startup.  These checks have to be performed before any .py
files are imported, otherwise you'd have some .pyc files dumped
out before the machinery is ready to go.

The first patch contains mods to sysmodule.c with next to
no concern for platform independence.  There is a small shell
script and a few expected output files which are used to
test setting of various values.  These should probably be
wrapped into regular PyUnit tests which popen() the interpreter
with different settings, but this seemed quicker as a start.