Merge pull request #53 from bluescreen303/ghc-mod

Cabal2Nix/PostProcess.hs: postinstall for ghc-mod
PostProcess.hs: add 'perl' package to git-annex
PostProcess.hs: ensure that pandoc has happy and alex available
src/Cabal2Nix/Name.hs: add mappings for ncursesw and panelw
src/Cabal2Nix/Flags.hs: remove obsolete configuration for pandoc
Cabal2Nix/PostProcess.hs: disable tests for llvm-general-pure
Cabal2Nix/PostProcess.hs: disable tests for llvm-general
Cabal2Nix/PostProcess.hs: remove conditional check for idris
0.9.9 is in master now