Improve and/or elucidate search results ordering

[geealbers]

Both Clair and @ruthlane find the search results a bit confounding, particularly for broadly used terms like "bust". I think the root of the issue is that results don't seem to be in any logical order. Readers have no way of knowing why one bust appears before another. So I think we need to find a way to refine the results if possible. Some questions:

• Can we weight the word appearance in different sections of the text? Description vs. Fabirc vs. Condition, etc..
• Can we order the results first by relevance and then by cat #? Or vice versa? And related, regardless of cat order, can front and back matter pages always appear last in the results order?

The other thing we could do is add a line of text at the top explaining to users how search results are derived. And this might be good to do regardless.

Finally, Claire also specifically asked about highlighting the relevant term on the page once you click through to it, but I'm right in remembering that we talked about this some time ago, and that's just not possible right? Would it be in some future iterations of this or other catalogues?

[geealbers]

@egardner to add text on search results page: "Results based on frequency of occurrence. A full index is available in the PDF and paperback."

[egardner]

Added that disclaimer text as of 0835c0d; we can look at other solutions for search in v2.