instances: fix a few wrong calls, move genHash method from rpc
remove some old ?op syntax notation calls
move batchAddFeeds to pref-feeds
remove small_article_preview
remove obsolete checkDate stuff
rpc: move setScore to article
rpc: move several feed-related calls to pref-feeds
rpc: move setArticleTags to article
rpc: move completeTags to article
rpc: remove getArticles
rpc: move labelops to article