patch applied (haskell-prime-report): reworking the informal explanation of pattern gaurds

[Isaac Jones]

Thu Jan 11 16:59:30 PST 2007  ijones at syntaxpolice.org
  * reworking the informal explanation of pattern gaurds
  Modified the syntax again to talk about "guards" (which are pattern guards,
  boolean guards, and let expressions) .  Moved the "Pattern guards" section
  I created before into the Case Expressions section.

    M ./report/decls.verb -3 +4
    M ./report/exps.verb -63 +71