add a div for filter form and pager on the top and bottom (patch)

hey

i've coded patch that adds a div with a class to allow styling more properly the pager on the top and seperate it from the other pages, as it was using the generic theme.

having a classed div allows that through CSS nesting. example:

div.uc-advanced-catalog-bar div.item-list {
  margin-top: 10px;
}

it also puts the filter form inside it.
btw, recommending:
- that this form id be renamed to uc-advanced-catalog-form
- that the form ids not be the same (uc-advanced-catalog-form-1 and uc-advanced-catalog-form-2) to allow further styling and proper HTML/CSS correctness

patch bellow. it was made against the latest 1.x-dev (2011-Jan-10), in UNIX line-ending, unified format.
supplying also a modified 1.x-dev file