* print-rt6.c: make IPv6 routing header printing work with new 2292bis

* print-rt6.c: make IPv6 routing header printing work with new 2292bis
  API.
* print-bgp.c: improve options printing.  ugly code exists for
  unaligned option parsing (need some fix).
* const poisoning in SMB decoder.
* make dump format back to original.  someone may want to add an
  option to do ascii printing, but keep the default behavior as is
  for scripts used in many places.
* -Wall -Werror clean checks.