Bug #131 - section special variables should be negated without problems.

>>>>templates/test.tpl
<opt:section name="foo">
{$foo.item}:
<opt:if test="not $system.section.foo.last">not last</opt:if>
{$foo.item}:
<opt:if test="not $system.section.foo.first">not first</opt:if>
</opt:section>

>>>>data.php

$obj1 = new stdClass;
$obj1->item = 'FOO';
$obj2 = new stdClass;
$obj2->item = 'BAR';
$obj3 = new stdClass;
$obj3->item = 'JOE';
$obj4 = new stdClass;
$obj4->item = 'GOO';

$view->foo = new ArrayObject(array(0 =>
	$obj1, $obj2, $obj3, $obj4
));
$view->setFormat('foo', 'Objective');

>>>>expected.txt
OUTPUT

>>>>result.txt
FOO:not last
FOO:
BAR:not last
BAR:not first
JOE:not last
JOE:not first
GOO:
GOO:not first