added schema patch for release 73

misc-scripts/ontology/sql/patch_72_73_a.sql

+-- patch_72_73_a.sql
+--
+-- Title: Insert schema version.
+--
+-- Description:
+--   Adding schema version to the meta table (set to 73)
+--   so that script schema_patcher.pl would work
+
+INSERT INTO meta (meta_key, meta_value)
+  VALUES ('schema_version', 73);
+
+-- Patch identifier
+INSERT INTO meta (meta_key, meta_value)
+  VALUES ('patch', 'patch_72_73_a.sql|schema_version');
+
+