A first shot at binary packages support for prefix. In itself, binary

A first shot at binary packages support for prefix.  In itself, binary
packages work fine of course, but once you want to share the binary
package between users with different prefixes (like from a binhost),
then you need to cope with that.  After some testing chpathtool appears
to be able to successfully change paths encoded in binaries, in order to
adjust to the proper prefix.  For a binhost setting, binary packages
need to have an artificially long and annoying prefix to make it work
the most people.

svn path=/main/branches/prefix/; revision=7706