Fixes running 'hg serve' with Windows executable and no explicit template path configured. PY2EXE executables don't support __file__ but do place the directory of the shared code library into sys.prefix. Fixes bug 152.

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m test -d "0 0"
hg history
hg manifest
hg cat a
hg verify