Make subrepo work when run in a worktree #407
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In a worktree (created with git worktree add) there is no .git directory. It is
instead a file. To make subrepo work correctly in that case, use the
--git-common-dir argument to git rev-parse to find the path to the .git
directory. In a regular directory it just prints .git, but in a worktree it
prints the full path to the .git directory.
Fix #361