bugfix: let people have literal %'s in their queries without confusing the parser

by using %% instead

simpletest/BasicTest.php

@@ -23,6 +23,11 @@ class BasicTest extends SimpleTest {
     DB::useDB('libdb_test');
   }
   
+  function test_0_5_date_format() {
+    $month = DB::queryFirstField("SELECT DATE_FORMAT(NOW(), '%%b')", 4);
+    $this->assert($month === date('M'));
+  }
+  
   
   function test_1_create_table() {
     DB::query("CREATE TABLE `accounts` (