#71 increase field element size

[Dan Yocum]

255 characters for a pull-down list is too few. I've
increased mine to 8191, and may go higher.

This is in class/ListingElement.php:

$tags["FIELD_ELEMENTS"] =
PHPWS_Core::formTextField("ELEMENT_field_elements",
$this->_field_elements,35,8191);

Cheers,
Dan