Replace general rules with individual line mappings
Replace worldpay callback rule with query-string mappings
Replace northgate root page callback with mapping
Replace businesslink_ukwelcomes piplink configuration with mappings
Remove remaining config for businesslink_ukwelcomes
Merge pull request #730 from rjc123/eliminate_businesslink_ukwelcomes

Replace businesslink_ukwelcomes site rules with mappings.