run-tests: fix hg.bat python reference
hg.bat expects to live in pythonxx/scripts and the python interpreter
to be in pythonxx. run-tests.py file layout is a little different and
python location must be fixed.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
See http://mercurial.selenic.com/ for detailed installation
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