identity_xref tables changes plus update to latest version number

modules/t/test-genome-DBs/homo_sapiens/core/identity_xref.sql

 CREATE TABLE `identity_xref` (
   `object_xref_id` int(10) unsigned NOT NULL default '0',
-  `query_identity` int(5) default NULL,
-  `target_identity` int(5) default NULL,
-  `hit_start` int(11) default NULL,
-  `hit_end` int(11) default NULL,
-  `translation_start` int(11) default NULL,
-  `translation_end` int(11) default NULL,
+  `xref_identity` int(5) default NULL,
+  `ensembl_identity` int(5) default NULL,
+  `xref_start` int(11) default NULL,
+  `xref_end` int(11) default NULL,
+  `ensembl_start` int(11) default NULL,
+  `ensembl_end` int(11) default NULL,
   `cigar_line` text collate latin1_bin,
   `score` double default NULL,
   `evalue` double default NULL,

modules/t/test-genome-DBs/homo_sapiens/core/meta.txt

-1	\N	schema_version	51
+1	\N	schema_version	53
 2	1	assembly.default	NCBI34
 33	1	species.classification	Chordata
 32	1	species.classification	Vertebrata