make all commands be repo-wide by default - refactor code in commands.py so that: if no pattern is given, the command will be repo-wide else it will work on the working dir - update the doc - fix the tests

#!/bin/sh

hg
hg -q
hg help
hg -q help
hg add -h
hg add --skjdfks
hg help diff
hg help status
hg -q help status
hg help foo
hg skjdfks

exit 0