Improve query search

Currently, one of the biggest pain points is that query search is so difficult.  We have many queries that are very similar (the queries are constructed thru code based on various flags/conditions) and it is very difficult to find the one you want.  Currently, i believe one cannot even search by AND'ing a bunch of conditions.  So, all you can do it seems is find some relatively unique term in the SQL to search for.  It's quite painful.

I'd like to see:

* support AND and OR conditions (or at least AND) in the search

* search by sql fragments, normalizing them to digest form since the search only seems to be against digests.  I know this will have limitations, eg if the columns are not qualified with the table name.  But, some very reasonably limitations can be imposed and still make the search infinitely more usable than it currently is.  

* in particular, one should be able to paste in a full SQL query and go to the queries page for that query.