Sped up some operations on remotes that are on the same host.

Specifically, disabled trying to update the git-annex branch on the remote,
since that data is never used by operations that act on such remotes.

Also, when copying content to such a remote, skip committing the presence
information changes to its git-annex branch. Leaving it in the journal there
is ok: Any command run on the remote that needs the info will flush the
journal.

This may partially solve this bug:
http://git-annex.branchable.com/bugs/fails_to_handle_lot_of_files/
Although I still see unreaped git processes piling up when doing a copy --to.

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