Add pagination to price, cost history grids for product view

tailbone/grids/core.py

@@ -985,6 +985,9 @@ class Grid(object):
         context['empty_labels'] = empty_labels
         if 'grid_columns' not in context:
             context['grid_columns'] = self.get_buefy_columns()
+        context.setdefault('paginated', False)
+        if context['paginated']:
+            context.setdefault('per_page', 20)
 
         # locate the 'view' action
         # TODO: this should be easier, and/or moved elsewhere?