[jhc] darcs patch: create a better relation representation, ... (and 4 more)

[John Meacham]

Fri Aug  6 01:26:22 PDT 2010  John Meacham <john at repetae.net>
  * create a better relation representation, speed up export chasing signifigantly

Fri Aug  6 02:03:49 PDT 2010  John Meacham <john at repetae.net>
  * split type environment into concrete and mutable sets, to avoid retraversing the concrete imported types

Fri Aug  6 02:28:15 PDT 2010  John Meacham <john at repetae.net>
  * further seperate out concrete types to speed up checking

Fri Aug  6 04:17:03 PDT 2010  John Meacham <john at repetae.net>
  * speed up name choosing a little

Fri Aug  6 04:28:20 PDT 2010  John Meacham <john at repetae.net>
  * clean ups
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