Haskell Presentation mode is broken

[geraldus]

Currently Haskell Presentation mode is likely broken.

Key bindings not work, failing with following errors:

command-execute: Wrong type argument: commandp, (function quit-window)
command-execute: Wrong type argument: commandp, (function haskell-present-clear)

Hint does not appear in newly created buffer (there should be a check in haskell-present function: if buffer does not exists create a new one, insert hint and make buffer read only).

[geraldus]

fixed in #696