Solution: accept only the mechanism defined by the socket options.

I've not tested this yet, so it's a speculative fix.

Solution: check that it rejects attempts to connect to a CURVE server
using NULL or PLAIN client.

Solution: document the limit of 113 chars including ipc://. We might
fix this in libzmq by shortening an over-long IPC pathname into a
unique string; so long as this is done consistently in bind and in
connect, it will save applications from weird failures when they
use external data to generate IPC pathnames.

It's bad practice to start by testing all exceptional conditions
and then dropping through to the 'normal' condition. Apart from
being inefficient, it's deceptive to the user. Conditional code
should always try to show the natural expectation of the code,
with exceptional cases coming last.

Solution: clean up this code.

- not initialized before use
- name is nasty (boolean variables should not have negative names)

Solution: rename to 'lossy' and initialize to 'true'.

Fix test broken when we changed FD_SETSIZE.

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