What's new:
-----------

- Introduce reading passwd/group entries directly from SAM/AD, thus allowing
  to do without /etc/passwd and /etc/group files.  Introduce /etc/nsswitch.conf
  file to configure passwd/group handling.

- /proc/cygdrive as a symlink pointing to the current cygdrive prefix.  This
  can be utilized in scripts to access paths via cygdrive prefix, even if the
  cygdrive prefix has been changed by the user.


What changed:
-------------


Bug Fixes
---------

- Don't hang in accept calls if socket is no listener.  Set errno to EINVAL
  instead.  Don't hang in read/recv/recvfrom/recvmsg calls if socket is
  connection oriented and not connected.  Set errno to ENOTCONN instead.

- Don't claim serial line is a tty.  Don't allow seeking on serial lines and
  sockets.  Set errno to ESPIPE instead.
  Addresses: https://cygwin.com/ml/cygwin/2014-08/msg00319.html