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Two notes:
since snap already depends on lens. But it could be avoided pretty easily, at the
cost of somewhat uglier code.
it otherwise.
snap-0.10 uses the lens package instead of data-lens, so we use
lens package lenses in M.hs. Also remove some unnecessary imports
in S.hs, bump the snap dependency, and add a direct dependency on
the lens package. (The last is needed because we're using functions
from Control.Lens that Snap does not re-export.)