[jhc] darcs patch: code cleanups, used located in hstype, u... (and 4 more)

[John Meacham]

Wed Feb  1 05:20:53 PST 2012  John Meacham <john at repetae.net>
  * code cleanups, used located in hstype, use packedstring for filename.

Thu Feb  2 20:17:57 PST 2012  John Meacham <john at repetae.net>
  * turn WarnType into a real algebraic data type.

Sat Feb  4 14:07:32 PST 2012  John Meacham <john at repetae.net>
  * switch kind inference to use the unified warnings mechanism, switch class declarations to use a HsClassHead 

Sat Feb  4 16:02:03 PST 2012  John Meacham <john at repetae.net>
  * improve kind checking, kind check instance heads before typechecking pass, switch HsInstDecl to use the HsClassHead

Sat Feb  4 16:30:34 PST 2012  John Meacham <john at repetae.net>
  * add ghc typecheck failure tests
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