`Query` options can be used in inappropriate places.

[tomprince]

Currently, Client::find and Client::search both accept a Query which has fields for filters, grouping, and windowing. But find and search only accept filters and windowing. I've got WIP implementations of list and findadd, the former only takes filters and grouping, the later only filters.

There are at least a couple of solutions:

• the most straightforward is to simply split up Query into its component parts and only accept the parts that are valid for each command.
• it'd also be possible to do something with phantom-types, but this seems more complicated for no gain.

[kstep]

This seems like an interesting idea. I may give it a try in a separate branch.