dev-haskell/hakyll: Fix trailing whitespace
sys-apps/nix: Fix trailing whitespace
dev-haskell/control-monad-exception: Update URL
dev-haskell/control-monad-exception: Add USE desc
dev-haskell/encoding: Add USE description
dev-haskell/gnuplot: Add USE descriptions
gnuplot: Make pipe preclude shell and vice versa
dev-haskell/haskeline: Add USE description
dev-haskell/httpd-shed: Add USE description
dev-haskell/midi-alsa: Add USE description
dev-haskell/peggy: Add USE description
dev-haskell/persistent: Add USE description
dev-haskell/threepenny-gui: Add USE descriptions
dev-lang/idris: Add USE descriptions
dev-vcs/git-annex: Add USE descriptions
dev-haskell/monadrandom: Add metadata
groundhog-sqlite: Remove unused USE descriptions
dev-haskell/mysql: Remove unused USE description
presistent-sqlite: Remove unused USE description
dev-haskell/pipes: Remove unused USE description