Lost taxa are now stored with the "lost_species_tree_node_id" tags

In e74, we changed the way the information about lost taxa is stored in the gene trees

befeore: http://www.ensembl.org/Homo_sapiens/Gene/Compara_Tree?db=core;g=ENSG00000073910;r=13:32605437-32870794
after: http://enssand-01.internal.sanger.ac.uk:9073/Homo_sapiens/Gene/Compara_Tree?db=core;g=ENSG00000073910;r=13:32605437-32870794

If you click on the blue squares off the collapsed the nodes ("Old World rodents: 2 homologs", "Laurasiatherian mammals: 12 homologs", etc), you'll see that the "Lost taxa" entry is not shown on the zmenus of the live site