new files for running regression tests under Python. Not yet complete, but

* regressions.py, regressions.xml: new files for running
  regression tests under Python.  Not yet complete, but
  should provide good testing under both Linux and Windows.
* testHTML.c, testSAX.c, xmllint.c: changed the 'fopen' used
  for --push testing to include the 'rb' param when compiled
  under Windows.
6 files changed