Improvements to level up and slot fill

- class level refs work with level up
- Improve UI
- Fixed level up backfill repeating levels when selecting higher levels
multiple times
- Allowed user to ignore slot fill condition
- Auto load more if many disabled fillers

app/imports/api/creature/creatureProperties/methods/insertPropertyFromLibraryNode.js

@@ -105,6 +105,8 @@ function insertPropertyFromNode(nodeId, ancestors, order) {
 
   // Convert all references into actual nodes
   nodes = reifyNodeReferences(nodes);
+  // Refetch the root node, it might have been reified
+  node = nodes[0] || node;
 
   // set libraryNodeIds
   storeLibraryNodeReferences(nodes);