These tests connected CLIENT and SERVER to DEALER... this isn't
allowed. I changed to CLIENT-to-SERVER in both cases. The result
was aborts in client.cpp and server.cpp which cannot handle
invalid multipart data.

I removed the asserts in each of these in xsend.

Solution: fix the test cases and remove the (unwanted?) asserts
in client.cpp:xsend and server.cpp:xsend.

Solution: fix to use CLIENT-to-SERVER and increase number of messages
sent to 100K per thread, to better stress thread safety.

This is due to the mangled include of platform.h, which was to make
CMake happy.

Solution: in CMakeLists.txt, define USING_CMAKE and then look for
platform.h in current directory if that is defined, else look in
../src/ as one would expect.

It should never be zero.

Solution: if rid cycles back to zero, bump to 1.

This has no sense IMO; people who need this can still use DEALER-DEALER.

Solution: let CLIENT talk only to SERVER.

We do not use 'get' for getters.

Solution: rename to zmq_msg_routing_id () for public API.

Update zmq_inproc manpage for bind/connect order

The order of zmq_bind() and zmq_connect() is no longer important
for the inproc transport since libzmq 4.0.  This updates this
in the zmq_inproc manpage.

Problem: Identity frame from router has no metadata

Problem: Private/internal macros defined in public header.

Solution: Move the macros to a private header.

rename ZMQ_UNUSED macro to LIBZMQ_UNUSED

Fix zmq crash when calling shutdown with a pending inproc socket connect

Set signaler_port to 0 which allows the OS to find a free port

-Set signaler_port to 0 which allows the OS to find a free port, rather than crashing if 5905 is in use (https://github.com/zeromq/libzmq/issues/1542)
-Added config.hpp to the source list so it shows up in generated projects
-Remove CMAKE_BUILD_TYPE setting for generators that don't use it

Problem: Source files contain mixed tabs and spaces.

Solution: Convert to spaces and remove trailing whitespace in these files.

Fixes failing tests regarding XPUB sockets.

Fixes tests that were introduced in a previous pull request. See
https://github.com/zeromq/libzmq/pull/1539#issuecomment-132968987

Addresses zeromq/libzmq#1116.

This patch  adds a new member of type deque to the
xpub class that contains pointers to metadata_t.
This deque is then used (alongside pending_data
and pending_flags) to preserve metadata when
copying messages.

The routing id (identity) frame return when reading from
a router doesn't have the same metadata as the "real"
message that follows.
For example, The ZAP "User-Id" property is missing.

This patch attach the "data message"'s metadata
to the "identity message" when it is read from the router.

CI run on OSX needs binutils

problem: trying to support polling on thread safe sockets with zmq_poll failed

OSX does not ship with binutils, need to install it before the script
run via brew in order to be able to use greadelf, needed by the
qt-android CI script.

problem: new poller field in zmq_pollitem_t is changing the api

Problem: tests fail after PR #1531

apply a change to LIBZMQ_DELETE macro (related to issue #1524)

define a macro for heap object deletion in a unified manner (related …