Problem: unused parameter in benchmark function

Solution: remove it

Problem: use of malloc is error-prone

Static analysis warnings

Solution: use std::vector instead, simplify control-flow

Solution: set -e in ci_build.sh like in other scripts

Solution: don't write it

Solution: add them

problem: wrong api_key for bintray

Solution: update it

Free memory when curve_client sends invalid ready message.

Problem: Missing ZeroMQ_INCLUDE_DIR when only static lib is built

Problem: 4.3.2 is out, need new version

Solution: bump to 4.3.3

CVE-2019-13132

Solution: bump them

Solution: list new features and bug fixes

Solution: fix them

Solution: create buffers large enough to contain arbitrary metadata

Request handling leaked memory.  Depending on the application's use o…

Add relicense agreement from Lourens Naudé

Problem: no security policy

Solution: add SECURITY.md with supported branches and maintainers public keys for private communications

Problem: code doesn't follow libzmq naming conventions

Solution: rename types/variables that are inconsistent

Clarify documentation for zmq_unbind/disconnect and new batch options

Solution: restore separate zmq_unbind documentation, adding a note that the implementation
might be shared but the semantics are different and should not be mixed.
This avoids tying the API to the implementation details which might change for some
engines.

Solution: clearly advise users to avoid them in all cases to
avoid unforseen problems.
Also fix markdown syntax, applicable transport types and getter description.

Problem: variable and type names are not descriptive

Problem: {in,out}_batch_size must be configured at compiled time

Solution: use more descriptive names

This commit also improves comments related to some of the changes.

Solution: Added a socket option to configure them at runtime.

Problem: missing heartbeat test for draft sockets

Solution: Add heartbeat tests for CLIENT, SERVER, GATHER and SCATTER
    socket types. RADIO and DISH tests won't be added since heartbeating
    is not yet supported.