Edouard Tisserant [Tue, 09 Jul 2019 08:31:02 +0200] rev 1088
Add a column to VARIABLES.CSV, containing variable (derived) type name, additionally to current last column contyaining base type name
Mario de Sousa <msousa@fe.up.pt> [Wed, 13 Feb 2019 14:40:26 +0000] rev 1087
add default NULL value to references (as suggested by anonymous in issue 62)
(Not really needed, but it is good practise...)