added vim ghc-mod plugin, along with corresponding nice mappings. Also separated the lushtags+tagbar config into the haskell.vim file
added the conceal and fold and module-name haskell plugins, along with corresponding bindings
autoindent
adding mapping from F9 to GhcModCheck
made possible remapping of F9 (compile) by language-specific configs
removing haskell-specific stuff from master which remained there after the merge