acct: update from 6.6.1 to 6.6.2 and adopt it
haskell-purescript: re-generate with cabal2nix
haskell-Agda: update to version 2.4.2.1
haskell-ReadArgs: update to version 1.2.2
haskell-conduit: update to version 1.2.3
haskell-cprng-aes: update to version 0.6.1
haskell-json: update to version 0.9
haskell-markdown: update to version 0.1.12
haskell-mwc-random: update to version 0.13.2.2
haskell-rest-gen: update to version 0.16.1.2
haskell-securemem: update to version 0.1.4
haskell-shakespeare: update to version 2.0.2.1
haskell-yesod-bin: update to version 1.4.0.7
haskell-cabal-db: update to version 0.1.11