structured-haskell-mode: byte compile sources.

Also, don't mess with cabal, manage package separately
(cabal install structured-haskell-mode)
Minor changes in dired-mode options.
ibuffer: filter haskell-interactive stuff.
org: don't update agenta on org file save.
Try 'structured-haskell-mode' one more time.
Set up 'haskell-process' stuff.
haskell-mode: dealing with tags.
haskell-mode indentation commands.
Few small fixes.