- add new modules (zipimport, datetime, _random, bz2, _symtable)
- build pyexpat with expat sources from Python distribution
- regression test with and without compiled bytecode
- the security fixes to tempfile have lead to test_tempfile wanting
to create 100 temporary files. as the EMX default is only 40,
the number of file handles has been bumped (up to 250).
- changes to pgen have required restructuring its build support.