Production adjustment fix

* The production adjustment function was completely off (and always has
been). It has been fixed.

* The problem with the adjustment function not being reported means that
no-one ever encountered it. As a consequence, happiness strike threshold
has been increased to 50%

/!\ Full database reset required (or at least much easier than other
options).

legacyworlds-server-data/db-structure/tests/user/040-functions/050-computation/020-adjust-production.sql

@@ -0,0 +1,12 @@
+/*
+ * Test privileges on verse.adjust_production()
+ */
+BEGIN;
+
+	SELECT plan( 1 );
+	
+	SELECT diag_test_name( 'verse.adjust_production( ) - EXECUTE privilege' );
+	SELECT lives_ok( $$ SELECT verse.adjust_production( 1 , 1 ) $$ );
+	
+	SELECT * FROM finish( );
+ROLLBACK;