Add test for fixed #35.
Fix -Wall warnings on Parser.hs.
Fix -Wall warnings on ExactPrint.hs.
Fix -Wall warnings on Extension.hs.
Fix -Wall warnings in SrcLoc.hs.
Fix -Wall warnings in ParseSyntax.hs.
Fix -Wall warnings in ParseUtils.hs.
Fix -Wall warnings in Build.hs.
Fix -Wall warnings in annotated Build.hs.
Fix -Wall warnings in Simplify.hs.
Fix -Wall warnings in ParseMonad.hs.
Fix -Wall warnings in Pretty.hs.
Fix remaining -Wall warnings in ParseMonad.hs.
Disable the orphan instance warning for Extensions.hs.
Turn on -Wall as default.
Adjust the precedence when prettyprinting NegApp. Fixes #84.
Add test for #84.