Problem: FD_SETSIZE 1024 is too restrictive under Windows

Solution: increased to 4096 by default for all MSVC builds, for MinGW,
and for CMake.

Note: this is a speculative change, it needs confirmation before we
can keep it. Particularly, there is some doubt that changing this in
libzmq will affect upstream applications using libzmq.dll.

Code cleanup

Add const qualifier to source parameters for z85 encode/decode

Reset metadata for outbound messages

Bugfix wrong CMakeLists.txt after rename of file

Documentation patches

Renamed test case to actually explain what it's testing, and cleaned up
the code a little.

Solution: change setsockopts on printable keys to expect 41, nor 40
bytes. Code still accepts 40 bytes for compatibility, and copies the
key to a well-terminated string before using it.

Fixes #1148

Code cleanup

Provide socket option for pub sockets to not silently drop message

Document altered HWM behaviour when ZMQ_ROUTER_MANDATORY is set.

Add test for HWM behaviour for mandatory ROUTER sockets over tcp

moved root CMakeLists.txt tests config to tests/CMakeLists.txt

Update zmq_msg_get(ZMQ_SHARED) to return true for type_cmsg messages

define encoding for message metadata to be UTF8

use enum retired_fd instead of -1

clarifies that these are text fields,
and removes ambiguity about how to create proper
text object from stored bytes.

Problem: does not install man pages correctly when out of tree

Solution: fix Makefile.am

As per Richard Sharpe on zeromq-dev.

z/OS: Updated to build libzmq git master

Updated:
    builds/zos/README.md: Updated with portability notes resulting
       from building zeromq/libzmq/master as of 2014-07-23 on z/OS
       UNIX System Services.

       Current z/OS UNIX status: all expected tests pass, except
       "test_proxy", which hangs and times out.