fork off git-annex copy for transfers

This doesn't quite work, because canceling a transfer sends a signal
to git-annex, but not to rsync (etc).

Looked at making git-annex run in its own process group, which could then
be killed, and would kill child processes. But, rsync checks if it's
process group is the foreground process group and doesn't show progress if
not, and when git has run git-annex, if git-annex makes a new process
group, that is not the case. Also, if git has run git-annex, ctrl-c
wouldn't be propigated to it if it made a new process group.

So this seems like a blind alley, but recording it here just in case.

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