Technology implementation

* A stored procedure which implements technologies has been added. It
will mark a pending technology as implemented and remove the
corresponding quantity of money from the empire, then add any newly
available research items to the empire's research.

legacyworlds-server-data/db-structure/tests/user/040-functions/040-empire/015-technology-implement.sql

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+/*
+ * Test privileges on emp.technology_implement()
+ */
+BEGIN;
+	SELECT plan( 1 );
+	
+	SELECT diag_test_name( 'emp.technology_implement() - EXECUTE privilege' );
+	SELECT lives_ok( $$
+		SELECT emp.technology_implement( 1 , '' );
+	$$ );
+	
+	SELECT * FROM finish( );
+ROLLBACK;