added single-keystroke F12 mapping to haskell type inference using ghc-mod
added better quickfix window toggling
substituted Gundo plugin (dependent on python) for Undotree, which is 100 percent VimL pure and much better
added options to make latexmk silent and force on errors for LatexBox plugin
Merge branch 'haskell'. From now on, haskell-specific vim cfgs will be kept in a separate repo

Conflicts:
	config/haskell.vim