/*
   * Explain a decision
   *
   * returns Ruleinfo
   * Needs 'request' passed for satsolver version 1110
   *
   * call-seq:
   *  decision.ruleinfo -> Ruleinfo
   *  decision.ruleinfo(request) -> Ruleinfo
   *  
   *
   */
  __type ruleinfo(Request *t = NULL)