Re-add 'By ' to post header, show 'edited by' on same line
Re-add 'By ' to post header, show 'edited by' on same line

Two lines takes too much space. I'm afraid no 'By' before the author's
name would be confusing.

debiki/debiki-server-old,debiki/debiki-server-old,debiki/debiki-server-old,debiki/debiki-server-old