[arch-multilib] New repositories (community-staging, multilib-testing)

The TU server now has a staging repository, this has been requested due to the big python rebuild. All rebuilds that are made for the staging repository should be put into community-staging now. multilib now has a testing repository, in case we need it (especially useful when testing has a new toolchain). Last but not least, the adjust-permissions cronjob has been disabled on both servers - should you mess with the db file directly (which you really shouldn't), never forget to restore the right permissions.