sqleval() can now be used with %s, %i, and all that good stuff

there is probably no good reason to do this, as things like md5() can be done
from PHP, but people keep asking for it, so here it is :)

simpletest/BasicTest.php

@@ -135,16 +135,17 @@ class BasicTest extends SimpleTest {
   function test_4_1_query() {
     DB::insert('accounts', array(
       'username' => 'newguy',
-      'password' => DB::sqleval("REPEAT('blah', 3)"),
-      'age' => 172,
+      'password' => DB::sqleval("REPEAT('blah', %i)", '3'),
+      'age' => DB::sqleval('171+1'),
       'height' => 111.15
     ));
     
     $row = DB::queryOneRow("SELECT * FROM accounts WHERE password=%s", 'blahblahblah');
     $this->assert($row['username'] === 'newguy');
+    $this->assert($row['age'] === '172');
     
     DB::update('accounts', array(
-      'password' => DB::sqleval("REPEAT('blah', 4)"),
+      'password' => DB::sqleval("REPEAT('blah', %i)", 4),
       ), 'username=%s', 'newguy');
     
     $row = null;