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

Thu Jan 11 16:59:30 PST 2007 ijones@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