Inject SQL right into the WHERE clause

This module has been very helpful for me in doing some complicated filter work on views — thank you!

One thing that struck me, though, was that I was hitting the database twice to get things... once with the WHERE clause in an SQL statement like I wished I could have it in part of the underlying view, and then again once I'd retrieved list list of nodes and actually fired the view's query. So I thought, "Wouldn't it be helpful to just embed that bit of SQL into the view's WHERE clause?" So, I modified this module to be able to do that. In addition, I needed some sophistication around that in terms of supplying URL arguments and other bits to the WHERE clause, and so the accompanying patch accommodates all that too. I've included a screenshot as well, as I reckoned the documentation should be beefed up given the functionality added.

Would be great if this made it into the next version!

Shawn