rename sql directory to lib-sql

Also introduces a separate constant for the sql directory, so that
it can be put separately from the rest of the data if required.

lib-sql/table-triggers.sql

@@ -0,0 +1,22 @@
+-- insert creates the location tables, creates location indexes if indexed == true
+CREATE TRIGGER placex_before_insert BEFORE INSERT ON placex
+    FOR EACH ROW EXECUTE PROCEDURE placex_insert();
+CREATE TRIGGER osmline_before_insert BEFORE INSERT ON location_property_osmline
+    FOR EACH ROW EXECUTE PROCEDURE osmline_insert();
+
+-- update insert creates the location tables
+CREATE TRIGGER placex_before_update BEFORE UPDATE ON placex
+    FOR EACH ROW EXECUTE PROCEDURE placex_update();
+CREATE TRIGGER osmline_before_update BEFORE UPDATE ON location_property_osmline
+    FOR EACH ROW EXECUTE PROCEDURE osmline_update();
+
+-- diff update triggers
+CREATE TRIGGER placex_before_delete AFTER DELETE ON placex
+    FOR EACH ROW EXECUTE PROCEDURE placex_delete();
+CREATE TRIGGER place_before_delete BEFORE DELETE ON place
+    FOR EACH ROW EXECUTE PROCEDURE place_delete();
+CREATE TRIGGER place_before_insert BEFORE INSERT ON place
+    FOR EACH ROW EXECUTE PROCEDURE place_insert();
+
+CREATE TRIGGER location_postcode_before_update BEFORE UPDATE ON location_postcode
+    FOR EACH ROW EXECUTE PROCEDURE postcode_update();