Do not filter out duplicate subscriptions on the XSUB side of
XSUB/XPUB, so that ZMQ_XPUB_VERBOSE doesn't get blocked by forwarding
devices (as long as the devices all use ZMQ_XPUB_VERBOSE)

Cleanups to man pages

Resolve LIBZMQ-452

Resolve LIBZMQ-417

Ref: https://zeromq.jira.com/browse/LIBZMQ-452

Ref: https://zeromq.jira.com/browse/LIBZMQ-417

Fix Build Regression #449: Move socket_base.hpp and err.hpp after poll.h include

These two headers also include zmq.h somewhere in their dependency
chain, so must be included after poll.h is included for builds to work
on AIX.

Fixed whitespace and style

Fixed build regression #449

Fixed build regression

Packages did not build - fixed

Updated master version to 3.2.2

Duplicate CMake patch set from zeromq3-x

Add metadata to CMake options; mark executables advanced to hide from default view; fix WoW64 redirections.

Removed check for COPYING.txt

Explicit comments