Haskell singleton libraries

Notes on current Haskell singleton libraries:

Permanent

 * chalmers-lava2000: electronics library

False positive

 * language-c: pure-gen

Temporary

 * MonadCatchIO-mtl: for feldspar-compiler (and hint)
 * ansi-terminal: feldspar-compiler
 * cabal-file-th: hledger
 * cautious-file: yi
 * cereal: yesod-core
 * csv: hledger

Unused

 * colour: reverse deps
 * editline: reverse deps
 * ranges: 3 reverse deps
 * regex-pcre: for older hakyll reverse deps