Add Haskell packages: hscope and pure-cdb
Add Haskell package: haskell-docs
Merge pull request #3578 from ts468/haskell-hscope

Add Haskell packages: hscope and pure-cdb
Merge pull request #3579 from ts468/haskell-haskell-docs

Add Haskell package: haskell-docs
Add Haskell package: pointfree