mq: fix queue.apply to not call os.chdir()
call to os.chdir broke "hg -R dirname qpush".
instead pass -d (change directory) option to patch command.
#!/bin/sh
hg init
echo This is file a1 > a
hg add a
hg commit -m "commit #0" -d "1000000 0"
touch b
hg add b
rm b
hg commit -A -m"comment #1" -d "1000000 0"