mq: support "qimport --existing --name renametothis thatexistingpatch"
Before this change, the command would abort with a not too clear "patch
renametothis does not exist" error.
This change makes:
qimport --existing --name renametothis thatexistingpatch
equivalent to:
qimport --existing thatexistingpatch; qrename thatexistingpatch renametothis
% Without -v
access log created - .hg/hgrc respected
% errors
% With -v
listening at http://localhost/ (bound to 127.0.0.1:HGPORT1)
% errors
% With -v and -p HGPORT2
listening at http://localhost/ (bound to 127.0.0.1:HGPORT2)
% errors
% With --prefix foo
listening at http://localhost/foo/ (bound to 127.0.0.1:HGPORT1)
% errors
% With --prefix /foo
listening at http://localhost/foo/ (bound to 127.0.0.1:HGPORT1)
% errors
% With --prefix foo/
listening at http://localhost/foo/ (bound to 127.0.0.1:HGPORT1)
% errors
% With --prefix /foo/
listening at http://localhost/foo/ (bound to 127.0.0.1:HGPORT1)
% errors