Added timestamp to project tree, and made some class variables internal in various classes

nw/gui/outline.py

@@ -179,11 +179,8 @@ class GuiOutline(QTreeWidget):
 
         # If the novel index has changed since the tree was last built,
         # we rebuild the tree from the updated index.
-        lastChange = self.theParent.theIndex.timeNovel
-        logger.verbose("Last outline build: %.3f" % self.lastBuild)
-        logger.verbose("Novel index change: %.3f" % lastChange)
-
-        doBuild = lastChange > self.lastBuild and self.theProject.autoOutline
+        idxChanged = self.theParent.theIndex.novelChangedSince(self.lastBuild)
+        doBuild = idxChanged and self.theProject.autoOutline
         if doBuild or overRide:
             logger.debug("Rebuilding Project Outline")
             self._populateTree()