#1 Workaround for Stack->pop()

[Bas Cancrinus]

If Stack->pop() is executed by recent versions of PHP
then the following fatal error occurs:

"Only variables can be passed by reference".

Splitting the nested statement in Stack->pop() results
in normal method execution.

[Bas Cancrinus]

Diff file for phrame/util/Stack.php

[Bas Cancrinus]

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I forgot to mention that this error only occurred when a
session variable referenced a Stack instance and method
invocations occurred through that variable (like
$_SESSION['_ERRORS'] in the examples).