patch applied (packages/mtl): Proposal in trac #1059: Control.Monad.Error documentation

[Ian Lynagh]

Tue Jan 30 17:37:20 PST 2007  Ian Lynagh <igloo at earth.li>
  * Proposal in trac #1059: Control.Monad.Error documentation
  Andriy Palamarchuk writes:
  * Converted the module documentation to Haddock format.
  * Per Jeff Newbern's gracious permission included relevant information
    from his cool tutorial "All About Monads" http://www.nomaware.com/monads/.
  * Added examples for custom error type, ErrorT.
  * Use String instead of [Char].

    M ./Control/Monad/Error.hs -42 +181