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

$view->foo = array(0 =>
	array('item' => 'FOO'),
	array('item' => 'BAR'),
	array('item' => 'JOE'),
	array('item' => 'GOO'),
);
$view->setFormat('foo', 'Array');

>>>>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