test_support.import_module on the appropriate modules
before any other imports.

correctly rounded, using round-half-to-even.  This ensures that the
value of float(n) doesn't depend on whether we're using 15-bit digits
or 30-bit digits for Python longs.

is deprecated.  Use an explicit int() instead.

Make _pagesize static.

env parameter that on Windows SystemRoot is required in order
to run side-by-side assemblies.

tests by R. David Murray