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Whats changed in the codebase

# $Id: whats-new-code.txt 497 2006-05-27 23:32:21Z stu $

First, please note one thing - a *LOT* has changed in hybrid-7.

* Most of the file descriptor and network code has been rewritten.
  A lot of ideas were borrowed from squid, but they have been simplified
  in places and extended in others to cover the needs of hybrid-7.

  The core network routines now sit in src/s_bsd.c. There are some remnants
  of client/server specific functions which should really be moved.
  The actual network IO loop lives in src/s_bsd_${type}.c where ${type}
  is the type of network loop (poll, select, kqueue, etc.)
  You can select the type of network loop by passing --enable-${type} /
  --disable-${type} to configure.

  Note: the code hasn't been rearranged, its been rewritten. We think
  it is more efficient, but the split-list code in s_bsd_poll.c needs some
  further research.

  Please read the documentation available, which will go into more detail.

* An event system has been added, again borrowed mainly from squid. This
  allows periodic events (channel cleanup, server connection retries, etc)
  to be scheduled without needing to add it to the main loop.

* Server to server links are now handled by the 'servlink' program
  (located in the servlink/ directory).  After negotiating a server<->server
  link, (CAPAB/SERVER/PASS or CAPAB/CRYPTSERV/CRYPTAUTH) hybrid-7 will
  fork, then exec a servlink process.  ircd-hybrid communicates with the
  program using a control socket (turn on/off crypto/zip, etc), and
  a data socket (which looks to the rest of the code like a network socket
  connected to the remote server).  The servlink process handles encryption
  and compression of server links, but is still compatable with ziplinks
  used in hybrid-6, and the hybrid-6 cryptlinks patch.