[jhc] darcs patch: accept empty class contexts (and 3 more)

[John Meacham]

Mon Aug  9 23:38:32 PDT 2010  John Meacham <john at repetae.net>
  * accept empty class contexts

Tue Aug 10 16:02:16 PDT 2010  John Meacham <john at repetae.net>
  * add regex-compat to dependencies

Tue Aug 10 16:33:04 PDT 2010  John Meacham <john at repetae.net>
  * allow unicode characters in haskell source

Tue Aug 10 17:24:45 PDT 2010  John Meacham <john at repetae.net>
  * add 'skip' to regression options to skip certain tests
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