Fixing ProQuest search, widening ebrary's domain

ProQuest search results now include ebrary e-books in an extra tab. Zotero scrapes were returning everything regardless of which tab was visible, and these extra items caused the ProQuest translator to crash.

This fix changes the scrape results based on which tab is visible (database results or e-books), excludes some invaild sidebar links from the results, and calls the ebrary translator to handle ebrary e-book results. The ebrary translator was updated to handle links that come from ProQuest.
I know this was there before, but you were trying to clean up the multiples list from capturing items that were not actually search results. Do you think this is still necessary? Otherwise, it seems like we would be picking up extraneous links. Remove this based on your judgement.