Common/.../Prim.hs : Add boxDouble# and unboxDouble.
Common/.../Loop.hs : Fix initLoopState and add comments.
Common/.../Debug.hs and New3 : Tweaks to debugging.
New[34]/: Fix encodeDoubleInteger and update test for it.
Add 'make hlint' target and fix a bunch of hlint warnings.
Rename Check/NewX.tpl.hs -> Check/NewX.template.hs.