[9fans] hg 1.7.5

[erik quanstrom]

steve stallion refreshed the hg port to plan 9.  we now
have version 1.7.5, and a new record-length 95-page
man page.  ;-)

if you've already installed bichued's python, the instructions
for getting it installed are

        ; contrib/remove bichued/hg
        ; rm -r /sys/lib/python/mercurial
        ; contrib/install stallion/mercurial

otherwise, just

        ; contrib/install stallion/mercurial

many thanks to steve for slogging through this.

- erik