Walks entire tree, dumping all records on each page
        in sequential order

def dumptree(self, pn):
        """
        Walks entire tree, dumping all records on each page
        in sequential order
        """
        page = self.readpage(pn)
        print("%06x: preceeding = %06x, reccount = %04x" % (pn, page.preceeding, page.count))
        for ent in page.index:
            print("    %s" % ent)
        if page.preceeding:
            self.dumptree(page.preceeding)
            for ent in page.index:
                self.dumptree(ent.page)