Database: Allow "." in field

Author: jmontoyaa

main/inc/lib/database.lib.php

@@ -836,6 +836,6 @@ public static function listTableColumns($table)
 
  public static function escapeField($field)
  {
- return self::escape_string(preg_replace("/[^a-zA-Z0-9_]/", '', $field));
+ return self::escape_string(preg_replace("/[^a-zA-Z0-9_.]/", '', $field));
  }
 }