Wrap up initial vendor catalog batch support etc.

* Adds the ability to delete all batch rows matching current query.
* Refactors some progress factory args.
* If batch initialization fails, don't persist batch.

tailbone/views/grids/alchemy.py

@@ -169,6 +169,8 @@ class SearchableAlchemyGridView(PagedAlchemyGridView):
 
     def modify_query(self, query):
         join_map = self.join_map()
+        if not hasattr(self, '_filter_config'):
+            self._filter_config = self.filter_config()
         query = grids.search.filter_query(
             query, self._filter_config, self.filter_map(), join_map)
         if hasattr(self, '_sort_config'):