[jhc] darcs patch: properly check for duplicate instances (and 3 more)

[John Meacham]

Sat Feb  4 17:56:51 PST 2012  John Meacham <john at repetae.net>
  * properly check for duplicate instances

Sat Feb  4 18:58:15 PST 2012  John Meacham <john at repetae.net>
  * check superclass constraints on instance declarations

Sun Feb  5 00:21:56 PST 2012  John Meacham <john at repetae.net>
  * fix up library to pass the more strigent typechecking

Sun Feb  5 03:08:57 PST 2012  John Meacham <john at repetae.net>
  * generate reverse name map during renaming
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