Bug 75715 - untie comments from wikilog; enable comments for other pages by talk namespaces list
Bug 75715 - enable comments for custom namespace but not untie comments from wikilog
Bug 75715 - rollback useless changes
Better var names
Rollback one more check
Save comment metadata in comment article for restoring

Please apply archives/fill-wikilog-comment-meta.sql to fill
comment metadata for existing comments.
Suppress comment notifications during import