#2 Cache for repeated search hits

[dragon788]

Once SS gets going repeated search terms are likely, a
cache would help speed up searching and would also be a
practical application of the most recent search list.

[Bryan Burgers]

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This is a retrieval side request and will be dealt with later
when more time is spent on the retrieval side of the project.
Your requests for retrieval side features are still very welcome,
they are just not as urgent.