add -d and -s to show/set default paths

[TK Soh]

--- Matt Mackall <mpm at selenic.com> wrote:
> As for knowing about 'default=', I don't see how that's any less special
> than '-d'.

Certainly "-d" is less keys to type than "default", and using -d mean we can
make "default" more transparent to users - if there's ever a need to change it
later. In any case, there should at least documentation on "default=". I don't
see it in the manpages, or perhaps I missed it.


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