changed to key value pairs

misc-scripts/xref_mapping/xref_mapper.input

-# $species, $host, $port, $dbname, $user, $password ,$dir
-homo_sapiens	ecs2	3365	homo_sapiens_core_24_34e	ensro		./test
+xref
+host=ecs1g
+port=3306
+dbname=ianl_test_xref
+user=ensadmin
+password=ensembl
+dir=./xref
+
+species=homo_sapiens
+host=ecs2
+port=3365
+dbname=homo_sapiens_core_24_34e
+user=ensro
+password=
+dir=./test