Changes

copy the cluster class into a new dumbcluster class

the idea of the dumbcluster is that it supports the concept of slave servers that mount /var/aegir and therefore do not need to copy all those files around

first implementation of the dumbcluster, pretty dumb, based on cluster.php

rename the dumbcluster module to pack

really allow multiple master_web_servers

describe why this is named 'pack'

fix typo

also sync configs to slave server, which means we *can't* mount /var/aegir as a whole anymore

fix another typo

properly pass configs around