change nodequeue_nodes to supply a pager if queue is unlimited

here's the patch to do this.

Possible problem: if your queue has more items than the front page _and_ you don't specify a count of nodes to retrieve, then you won't get all the queue's nodes. Not sure if we can and/or need to fix this.

Also: If you have more than one queue with a pager on one page, you will want both pagers to work.

This can be fixed by either:

1) counting out pagers in a global variable. This will only work for the pagers that we add ourselves, third module pagers might get broken.

2) figuring out how many pages are already defined and then add ours. There are some global vars in pager.inc that might offer a solution to this.