Avoid negative block sizes in lazyparser. This fixes a bug introduced by changeset baa3873eb387 .

mq: add qdelete --forget option This removes an applied patch from the series and status files without popping it. It is useful when an mq patch has been applied upstream.

mq: do not update an empty working directory after strip. Closes #296.

mq: Add --git option to qrefresh

Add the -s option to `hg help qseries`.

sshrepo: don't try to validate when creating the repo - This removes the "repo not found" error when cloning or init-ing a remote repo. - Since the remote hg will abort if the repo already exists we don't need to validate it.

Make qrename handle directory targets; closes #333.