Merged changes to syntax/parse

Changed backtracking algorithm, runtime representations
    - syntax classes, ~describe no longer implicitly commit
    - ~describe no longer delimits effect of cut
  Added keyword & optional args for stxclasses
  Added ~do and #:do, ~post, ~commit and #:commit,
    ~delimit-cut and #:no-delimit-cut
  Added syntax/parse/debug, syntax/parse/experimental/*
    - expr/c for contracting macro sub-expressions
      moved from syntax/parse to syntax/parse/experimental/contract
    - syntax class reflection (~reflect, ~splicing-reflect)
    - eh-alternative-sets (~eh-var)
    - provide-syntax-class/contract
      (only for params, not attrs so far)
  Changed ~fail to not include POST progress (#:fail still does)
    old (~fail _) is now (~post (~fail _))
  Made msg argument of ~fail optional
  Removed generic "repetition constraint violated" msg
  Removed atom-in-list stxclass
  Removed unnecessary datum->syntax on cdr of pair pattern
    massive improvements to long-list microbenchmarks
  Optimization: integrable syntax classes (id, expr, keyword)
    need better measurements
  Optimization: ad hoc elimination of head/tail choice point
    for (EH ... . ()) patterns
  Added unstable/wrapc (proc version of expr/c)

original commit: d7a87c79e0211071fecb8474e6f7f66317b089d4

collects/macro-debugger/model/reductions-engine.rkt

@@ -1,6 +1,7 @@
 #lang racket/base
 (require (for-syntax racket/base
-                     syntax/parse)
+                     syntax/parse
+                     syntax/parse/experimental/contract)
          racket/list
          racket/contract
          "deriv.rkt"