* Explicitly import pure, (<$>), (<*>) and (<$) from Control.Applicative.
* Use DeriveDataTypeable pragma.
* Remove type signature from pattern synonym.
Make 'stackMerge' safer by implicitly appending any leftover elements
rather than discarding them. Otherwise on refresh the missing windows
will be deleted. This is only necessary if the stack has been shortened
- i.e. not required by this module.
Minor miscellaneous documentation fixes.
