Added Publishing feature. This feature is complete except it currently isn't available in the JavaScript interface.
fileservice: Added new JSON property "published", for each file under revision control. Added new actions svnpublish and svnunpublish. common/studpath: Added "published" function (to check if a file is published), and "authorize_public" to authorize in public mode. server: Now calls studpath.authorize_public for public mode (instead of just authorizing everything).