add isObsolete

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@11799 ee4ac58c-ac51-4696-9907-e4b3aa274f04

etc/qualifier_types_gff

@@ -82,6 +82,7 @@ germline         yes        none
 GPI_anchor_cleavage_site no "text"
 haplotype        no         "text"
 insertion_seq    no         "text"
+isObsolete       no         text
 isolation_source no         "text"
 isolate          no         "text"
 kinetoplast      no         "opt"