Add optional parameter for changed/added/del/unknown files to commands.dodiff
This makes it possible to avoid a call into repo.changes if the details
of what has changed is already known
#!/bin/sh
hg init
echo a > a
hg add a
hg commit -m "test" -d "0 0"
hg history
hg tag -d "0 0" "bleah"
hg history
echo foo >> .hgtags
hg tag -d "0 0" "bleah2" || echo "failed"