while refactoring, I thought it might be a good idea
only to use Query objects. But in this special case,
most often you'd just want to pass in a simple query
with a literal query string. So this convenience shortcut
indeed makes sense.
also touches the question how to represent the job
descriptor datastructure. @Cehteh: I've just pasted
in your preliminary data struct definitinons
from the relevant mailing list discussions.
