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I've attached a new version.  This has all the bootstrapping
necessary to import xrange and set it up properly.

The C code is still a bit sloppy.  The python version (which
is the only one used except for the xrange iterator over C
longs), is pretty clean and should work on the entire test
suite.

The python version has some additional features, at least
supporting negative indices.  It also warns on floats, not
sure if the C version does that or not.