MCE 1.863

on Perl CPAN

On Cygwin, silently use Mutex in MCE::Channel when Threads is specified
for better performance.

New defer capability in MCE::Signal. This applies to MCE::Shared 1.863.
See POD section labled "DEFER SIGNAL" in MCE::Signal.

Reverted $child->exit back to sending the SIGQUIT signal in MCE::Child
now that MCE::Shared::Server 1.863 defers signal during IPC.

Improved reliability for spawning MCE and MCE::Child inside threads
including nested parallelization, made possible using a global lock
$MCE::_GMUTEX.

Updated signal handling in mce-examples/framebuffer on GitHub.