* Support RTM_IFANNOUNCE message. route6d now works even when an

  interface is added or removed dynamically.

* Improve data structures for the prefix filter:

 - struct ifc (for interfaces) and struct iff (for filters) are now
   separated from each other; struct iff is now a separated
   singly-linked list which contains if_name in each entry.  Linear
   search is used for the prefix matching.

 - interface specifier in filtering rule now accepts non-existent
   interfaces at boot time and glob characters like gif* or fxp[012].
   (this is based on fnmatch(3))

* Add a new flags:

 - -P num: ignore routes marked as RTF_PROTO<num>.

 - -Q num: set RTF_PROTO<num> for routes added by route6d.

 - -p pidfile: specify the PID file.

* Increase retry count for NET_RT_DUMP to 15.

* Usage:

  These fix a typical issue when using route6d + other routing daemon.
  For example, net/openbgpd which uses RTF_PROTO1 for its routing
  entries.  However, route6d adds/removes routing entries regardless
  of the RTF_PROTO* flags, it happens that routes added by openbgpd is
  removed by route6d, and vice versa.  Adding "-P 1" solves this
  situation.  This is applied to net/quagga, too.

  Also, the glob character support greatly simplifies your command
  line options like this:

 [before]

 route6d_flags="\
  -N bge0,bge1,re0,gif0,gif1,gif4,gre0,gre1,gre2,gre3,gre4,gre5,gre6,\
gre7,gre8,gre9,gre10,gre11,gre12,gre13,gre14,bridge0 \
  -T gif2 \
  -O 2001:db8:705:ef00::/56,gif3 \
  -A 2001:db8:705:ef00::/56,gif3 \
  -L 2001:db8:19:ff::/64,gif3 \
 "

 [after]

 route6d_flags="\
  -P 1 \
  -N bge*,re0,gif[014],gre*,bridge* \
  -T gif2 \
  -O 2001:db8:705:ef00::/56,gif3 \
  -A 2001:db8:705:ef00::/56,gif3 \
  -L 2001:db8:19:ff::/64,gif3 \
 "

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