convert/gnuarch: use fully qualified revisions
There is no need loosing information in the conversion process. This could
lead to wrong shamap mappings if different archives used the same 'version'
naming.
Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
See http://www.selenic.com/mercurial/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.