Consider any integer greater than PG allows, to be invalid grid filter value

this feels pretty hacky...would be nice to come up with a better way

tailbone/grids/filters.py

@@ -472,6 +472,10 @@ class AlchemyIntegerFilter(AlchemyNumericFilter):
                 return True
             if not value.isdigit():
                 return True
+            # TODO: this one is to avoid DataError from PG, but perhaps that
+            # isn't a good enough reason to make this global logic?
+            if int(value) > 2147483647:
+                return True
         return False