Log Message:
Update to version 0.9.16.

Changes:

- Added public key based search support to WHOIS command.  Users can be
  searched by their public key now.  To search users by public key using
  SILC Client, do the following (see the /HELP WHOIS for revised help
  information on searching by public key):

  To search nickname 'nick' that has the specified public key, give:

    /WHOIS nick -pubkey /path/to/the/public_key.pub

  To search all usesr that has the specified public key, give:

    /WHOIS -pubkey /path/to/the/public_key.pub

- Removed RC6 cipher.

- Fixed the MOTD command to work properly.  Motds can now be fetched from
  remote servers.

- Fixed the INVITE string handling during joining to use correct server
  name.  Invite strings such as *@sauna.silcnet.org!*@*foobar.com now
  works.

- Fixed the CUMODE for founder mode work correctly when there is already a
  founder on channel.  Normal server cannot anymore "replace" a founder
  which is founder on router (even if authentication works).  User on
  router can "replace" founder that is on normal server assuming
  authentication is successful.

- Fixed UMODE mode change bug when anonymous mode was already set.  Now
  modes can be changed normally.

- Minor fixes to backup router protocol.  Some problems may still exist
  and testing this feature is recommended.

- Improvements to router-to-router connections.  Normal communication
  should work.  NOTE: This is experimental and you can expect problems
  if you set up such network.

- Several other bugfixes.