Store Phriction max version on Document, improve editing rules for editing documents with drafts master
Summary: Ref T13077. We need to know the maximum version of a document in several cases, so denormalize it onto the Document object. Then clean up some behaviors where we edit a document with, e.g., 7 versions but version 5 is currently published. For now, we: edit starting with version 7, save as version 8, and immediately publish the new version. Test Plan: - Ran migration. - Edited a draft page without hitting any weird version errors. - Checked database for sensible `maxVersion` values. Reviewers: amckinley Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam Maniphest Tasks: T13077 Differential Revision: https://secure.phabricator.com/D19625