Fixes #648

activity: use left join instead of inner join when fetching activities that may or may not have a child object

activitypub: allow skipping preload in some cases (like certain tests where the preload is obnoxious)

a higher score multiplier

This lets the user advertise a different port in the gopher urls,
for example listening locally on port 7070 but telling clients to
connect to the regular port 70.

kms

transmogrifier: upgrade: when upgrading OStatus users to AP, ensure we always use the fake collection