Haskell singleton libraries

Notes on current Haskell singleton libraries:

Permanent

• chalmers-lava2000: electronics library
• language-c: pure-gen

Temporary

• Diff (yi)
• MonadCatchIO-mtl: for feldspar-compiler (and hint)
• cautious-file: yi
• cereal: yesod-core

Unused

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