Require three or more chars to do lookup

Due to MySQL FULLTEXT min-word-lenn requirements (which various from
installation to installation), fulltext-based searches require at least two
characters.

include/ajax.orgs.php

@@ -29,7 +29,7 @@ class OrgsAjaxAPI extends AjaxController {
         $q = $_REQUEST['q'];
         $limit = isset($_REQUEST['limit']) ? (int) $_REQUEST['limit']:25;
 
-        if (strlen($q) < 2)
+        if (strlen($q) < 3)
             return $this->encode(array());
 
         $orgs = Organization::objects()

include/ajax.tickets.php

@@ -48,7 +48,7 @@ class TicketsAjaxAPI extends AjaxController {
 
         $q = $_REQUEST['q'];
 
-        if (strlen($q) < 2)
+        if (strlen($q) < 3)
             return $this->encode(array());
 
         global $ost;

include/ajax.users.php

@@ -34,7 +34,7 @@ class UsersAjaxAPI extends AjaxController {
         $users=array();
         $emails=array();
 
-        if (strlen($q) < 2)
+        if (strlen($q) < 3)
             return $this->encode(array());
 
         if (!$type || !strcasecmp($type, 'remote')) {