Adds in a hidden backtrace to all errors now. This should help track down issues much easier in the future.

Author: kormoc

includes/errors.php

@@ -145,6 +145,7 @@ function error_handler($errno, $errstr, $errfile, $errline, $vars) {
         else {
             echo "<hr><p><b>", error_type($errno), "</b>",
                 " at $errfile, line $errline:<br />$errstr</p>\n",
+                "<!-- ".build_backtrace($errno, $errstr, $errfile, $errline, $vars)." -->\n",
                 "<hr>\n";
         }
     }