#43 Improve search results ranking

[Eric Vaandering]

There are a number of shortcomings of the current
ranking scheme for documents

1) Matches in the title cannot be discriminated from
matches in the abstract or notes

2) Only one match in any category is counted. So a
match in the title AND abstract only counts once.
Worse, a match on two words in the title counts the
same as one

3) It would be good to try to incorporate the document
age into the ranking by Weight*(1-Age/Maximum Age) or
something like that so new documents rise to the top.
(Current sort does this for identically ranked documents)

[Eric Vaandering]

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We could also enable displaying results this way for the
advanced search (and maybe making it the default). I don't
know if this works in all cases.

But, changing things as mentioned above would mean
re-writing Search and moving a lot of the smarts into Perl
instead of SQL.