EHN: Add message code for integer out of range

proto/caosdb/entity/v1alpha1/main.proto

@@ -384,6 +384,11 @@ enum MessageCode {
 
   // TODO(tf) This property overrides the name.
   MESSAGE_CODE_PROPERTY_WITH_NAME_OVERRIDE = 79;
+
+  // Indicates that this server cannot process this integer value because it is
+  // out of range. The integer range is an implementation detail and thus this
+  // can happen even though the API allows the value.
+  MESSAGE_CODE_INTEGER_VALUE_OUT_OF_RANGE = 80;
 }
 
 // Messages are used by server's or client's to transport *transient*