Bug Fixes
---------

- Revert the following patch from 2.2.0:
  When started from a non-Cygwin process, check if $HOME starts with a
  slash (absolute POSIX path).  Otherwise ignore it.
  Addresses discussion starting at
  https://cygwin.com/ml/cygwin/2015-08/msg00048.html

- Fix output of /proc/cpuinfo in terms of cpu topology and cache size for
  modern CPUs and modern Windows OSes supporting more than 64 logical CPUs.
  Addresses: https://cygwin.com/ml/cygwin/2015-06/msg00345.html

- Don't call LsaLookupSids to fetch group information and don't perform RFC2307
  owner/group mapping on Samba/NFS if account info is only fetched from local
  passwd/group files.
  Addresses: https://cygwin.com/ml/cygwin/2015-07/msg00270.html

- Precautionally fix a potential data corruption problem in pipe I/O, only
  actually observered in Wine yet.  However, MSDN language indicates this
  might be a problem on real Windows as well.
  Addresses: https://cygwin.com/ml/cygwin/2015-08/msg00225.html