remove pos code from ug index. make ug fees get pos code from deliveries
get modules using new load_modules function
update tests
get pos code in the same way for both ug and pg
Merge pull request #795 from unikent/hotfix/deliveries-migration

More deliveries refactoring
Merge branch 'develop' of github.com:unikent/programmes-plant into feature/normalise-ug-pg-output
Unifiy PG/UG logic some more