Search results page in Directories return only 4 pages of results

There is a harcoded "sort_limit=100" in search.py. I think this is wise as long as we rely upon on the ZCatalog implementation.

Once WebLucene? (with builtin batching support) is integrated in CPS, we might remove that limit and refactor the search result template.

Actually, the directories doesn't use search.py. The limit is in the getBatchList.py.

I don't think it's ok to now show all the members in the directories, even if it implies a slower performance on searching.