
Once again, losts of changes to the upgrade target (but this time round, changing much to not change much, really Leopard like ;-)

 * Move all deletes to the top of the target;
 * Rework the sed rules block on the main conf file to exec only if a backup file is not found (meaning the rules wont exec a second time this target is run);
 * Rename the ports.conf file to its new macports.conf name in the above reworked block;
 * Remove now useless ports.conf --> macports.conf rule;
 * Similarly, rework the sed rules block on the sources.conf file to exec only if no backup file is found;
 * Intrudoce upgrade block for the conf file in the user speficif ~/.macports/ dir, following the guidelines in both previous blocks;
 * Fix our goodbye line from the upgrade target.

git-svn-id: dc463f922b716f8a7bf91846309830e794c23801@25925 d073be05-634f-4543-b044-5fe20cf6d1d6

neverpanic/macports-base,macports/macports-base,macports/macports-base,danchr/macports-base,danchr/macports-base,neverpanic/macports-base