Generalize the packge building scripts to be able to be run on more than
one 'head' node, rather than just pointyhat itself.
Constants are factored out into installation-specific files known as
portbuild/conf/server.conf and portbuild/conf/client.conf. There is
only one server.conf file. Individual <arch> directories may have
their own client.conf files, or may symlink to ../conf/client.conf.
Several bugs are fixed and improvements are made:
- parameterize everything.
- switch to csup. (This necessitates pushing the repos down one
directory level, e.g. ports-head/ports and src/src-8. However,
this will give us the flexibility to have e.g. src/src-8.1 in
the future.)
- note that the misnomer filename 'cvsdone', which was created
here, is now changed to '.updated'.
Feature safe: yes
