def shouldReportBuild(self, builder, buildnum):
        """Returns True if this build should be reported for this contact
        (eliminating duplicates), and also records the report for later"""
        for w, b, n in self.reported_builds:
            if b == builder and n == buildnum:
                return False
        self.reported_builds.append([util.now(), builder, buildnum])

        # clean the reported builds
        horizon = util.now() - 60
        while self.reported_builds and self.reported_builds[0][0] < horizon:
            self.reported_builds.pop(0)

        # and return True, since this is a new one
        return True
Returns True if this build should be reported for this contact
        (eliminating duplicates), and also records the report for later