add set_obsolete_on_delete option

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@10174 ee4ac58c-ac51-4696-9907-e4b3aa274f04

etc/options

@@ -2,7 +2,7 @@
 
 # (Note that comment lines start with a hash (#) symbol)
 
-# $Header: //tmp/pathsoft/artemis/etc/options,v 1.54 2009-02-26 16:27:31 tjc Exp $
+# $Header: //tmp/pathsoft/artemis/etc/options,v 1.55 2009-03-19 11:27:56 tjc Exp $
 
 # This file should contain option settings that look like this:
 #
@@ -830,4 +830,8 @@ chado_exon_model=CDS
 #  bigtest localhost:10120/test?pathdb
 
 # define how product qualifiers are stored (as a cv or as a featureprop)
-product_cv=yes
\ No newline at end of file
+product_cv=yes
+
+# set default delete behaviour to make things obsolete, if
+# this is not provided the default is to permanently delete
+set_obsolete_on_delete=yes