Increase location.contact length to 1024

Start numbering the scrips from 15000 as we do with cfg schema.
Postsvn.

db_scripts/diff/15000.down

@@ -0,0 +1 @@
+ALTER TABLE kamailio.location CHANGE COLUMN contact contact varchar(1024) NOT NULL DEFAULT '';

db_scripts/diff/15000.up

@@ -0,0 +1 @@
+ALTER TABLE kamailio.location CHANGE COLUMN contact contact varchar(255) NOT NULL DEFAULT '';