Motivation is something like:
I've cloned a remote repo, hacked locally and then `darcs send`d my
Now, I'd like to record some new patches without them depending on those
other patches I sent.
I'd like to be able to say `darcs obliterate --notInRemote remote_path`
to easily obliterate those patches that aren't available in the remote repo.
Also, Florent is going to buy me a beer, if I implement this feature ;-)
The following patch sent by Owen Stephens <email@example.com> updated issue issue2225 with
* resolve issue2225: add an option to obliterate all patches not in remote repo