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

- Support for POSIX-1.2008 locale objects and per-thread locales.

  New API per POSIX-1.2008: newlocale, freelocale, duplocale, uselocale,
  nl_langinfo_l, isalnum_l, isalpha_l, isblank_l, iscntrl_l, isdigit_l,
  isgraph_l, islower_l, isprint_l, ispunct_l, isspace_l, isupper_l, iswalnum_l,
  iswalpha_l, iswblank_l, iswcntrl_l, iswctype_l, iswdigit_l, iswgraph_l,
  iswlower_l, iswprint_l, iswpunct_l, iswspace_l, iswupper_l, iswxdigit_l,
  isxdigit_l, tolower_l, toupper_l, towctrans_l, towlower_l, towupper_l,
  wctrans_l, wctype_l, strcasecmp_l, strcoll_l, strerror_l, strfmon_l,
  strftime_l, strncasecmp_l, strxfrm_l, wcscasecmp_l, wcscoll_l,
  wcstrncasecmp_l, wcstrxfrm_l.

  New API, GNU extensions: isascii_l, toascii_l, strptime_l, strtod_l,
  strtof_l, strtol_l, strtold_l, strtoll_l, strtoul_l, strtoull_l, wcsftime_l,
  wcstod_l, wcstof_l, wcstol_l, wcstold_l, wcstoll_l, wcstoul_l, wcstoull_l.

- locale(1) now supports a -i/--input option to fetch the current input
  locale (this is basically equivalent to the current keyboard layout setting).

- New API: pthread_getname_np, pthread_setname_np.

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

- Drop support for Windows XP and Windows Server 2003/2003 R2.

- Drop support for very old SUNWNFS filesystem.

- Further header file improvements in terms of feature test macros.

- Raise number of supported partitions per disk (for raw access) to 63.
  Addresses: https://cygwin.com/ml/cygwin/2016-06/msg00136.html

- Add a workaround for filesystems not supporting the FileAllInformation
  info class.
  Addresses: https://cygwin.com/ml/cygwin/2016-07/msg00350.html

- Support AzureAD accounts.

- "nobody" account support for WinFSP.


Bug Fixes
---------

- Try to avoid spurious DENY ACEs when creating files in directories
  with non-POSIX-like (rather: Windows-like) permissions.
  Addresses: Report and reproducer on IRC.

- Make sure ldd(1) does not exit prematurely when enumerating DLLs.
  Addresses: https://cygwin.com/ml/cygwin/2016-05/msg00185.html

- Fix strace timer output in child process.
  Addresses: https://cygwin.com/ml/cygwin/2016-07/msg00067.html

- Change blkcnt_t to signed type per POSIX.

- Fix definition of SSIZE_MAX on 32-bit systems.
  Addresses: https://cygwin.com/ml/cygwin/2016-07/msg00179.html

- Fix transposing invalid chars in Windows filenames on relative paths.
  Addresses: https://cygwin.com/ml/cygwin/2016-07/msg00193.html

- Don't raise SIGTTIN from select(2)/poll(2).
  Addresses: https://cygwin.com/ml/cygwin-developers/2016-07/msg00004.html

- Use correct FPU rounding mode in truncl.
  Addresses: https://rt.perl.org/Public/Bug/Display.html?id=128665

- Fix a regression in ioctl(fd, FIONREAD, ...) introduced in Cygwin 2.5.0.
  This only affects 64 bit Cygwin.
  Addresses: https://cygwin.com/ml/cygwin/2016-07/msg00001.html

- Handle "clear screen" escpae sequence in console window more reliable.
  Addresses: https://cygwin.com/ml/cygwin/2016-07/msg00310.html

- Allow kill(pid, <anysig>) on zombies to return successfully, rather than
  only kill(pid, 0), to align behaviour with POSIX requirements.
  Addresses: https://cygwin.com/ml/cygwin/2016-08/msg00188.html