add: support adding explicit files in subrepos
Change the behavior of the add command such that explicit paths in
subrepos are always added. This eliminates the previous behavior
where if you called "hg add" for an explicit path in a subrepo
without specifying the -S option, it would be silently ignored.
If you specify patterns, or no arguments at all, the -S option
will still be needed to activate recursion into subrepos.
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