parsers.c: Added support for py3k.
This patch adds support for py3k in parsers.c. This is accomplished by including
a header file responsible for abstracting the API differences between python 2
and python 3.
#!/bin/sh
rm -rf a
hg init a
cd a
touch a
hg ci -Am0
hg mv a a1
hg ci -m1
hg co 0
hg mv a a2
hg up
hg ci -m2
touch a
hg ci -Am3
hg mv a b
hg ci -Am4 a
hg ci --debug --traceback -Am5 b
hg verify
hg export --git tip