[PATCH][LNT] Allow samples to be ordered "bigger is better"

[James Molloy]

Hi Chris,

Two patches are attached. The first introduces the concept of a "bigger is
better" sample type. This is useful for benchmarks that emit metrics such
as iterations/sec, or some abstract "score". The patch adds a database
migration and does the appropriate plumbing.

The second patch is a bit more hacky, but it adds a "score" sample type to
the default schema so any user can insert at least some samples with
"bigger is better" ordering.

If you'd prefer not to have this sample type upstream because it hasn't got
any use in the official instance, I'm happy to keep this as a downstream
patch.

Cheers,

James
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