prep work for PAUSE upgrade

[rjbs]

• eliminate some host-based config changing from the last upgrade; in the future, this kind of thing can be done with a changed PrivatePAUSE.pm
• chmod +x a cron job program
• improve the logger identification for default PAUSE code and for mldistwatch; more should be updated in the future
• teach the indexer to respect the PAUSE.CLOSED stopfile
• eliminate some unused Config settings
• stop updating the 07mirrors file

[andk]

Thanks, applied and deployed just now