cwdb2/Import Pagination

I bumped into an interesting IPB misfeature 2 days ago. An entire topic could be displayed with view=all. However, in a topic with 17+ pages this technique returns only the first page.

This blew a massive hole in the importer.

It was rewritten to do N+1 forum http requests, where N is the quantity of pages in the topic.

Also, we have better scraping feedback.. =)