Solution:
As preparation for 4.2 release, move the zmq_sendiov and zmq_recviov API
methods under the Deprecated Methods section.

Note: the actual methods have NOT been deprecated yet, functionally speaking
however it is good to let API users know early. Moreover, these methods were
not ever considered stable, at least according to src/zmq.h, and have no
associated man pages.

problem: compilation error on osx

problem: src is broken and unneeded as we have metadata

Problem: supported protocols comment is stale

problem: zeromq performance got worsen by some changes

Problem: Not all GCOV extensions in .gitignore

Solution:
Fix it.

problem: no way to enable draft on windows

problem: no way to disable draft when compiling

Solution: add it to .gitignore

Solution: do default test with DRAFT APIs enabled

Solution: mark them as DRAFT APIs

Solution: mark them as DRAFT APIs

Solution: mark them as DRAFT APIs

Solution: mark them as DRAFT APIs

Solution: mark them as DRAFT APIs

Solution: add support for --enable-drafts/ENABLE_DRAFTS=ON in
Autools and CMake.

Solution: only use ZMQ_SERVER/CLIENT if the defines are available.

Solution: before including internal headers, include platform.hpp
so that the build time options are correctly applied to the included
headers.

Solution: include platform.hpp and include/zmq.h outside of ifdef
for windows, in order to be able to use it for internal definitions.

Problem: bounce() arguments reversed

Problem: tune_tcp* related code has style issues

Problem: autoconf-archive m4 macros out of date

Solution:
Update them from the latest archive located at:
git://git.savannah.gnu.org/autoconf-archive.git

Hat-tip:
@bluca

Problem: zmq_setsockopt(3) man page formatting

Solution:
Fix it and align with the documentation; zmq_socket_monitor(3) outlines
that ZMQ socket monitoring is supported for TCP, IPC and TIPC.

Solution:
Put them in the right order to quiet Coverity.

Found by:
Coverity Scan

Solution:
- Update formatting and remove redundant parts from ZMQ_PROBE_ROUTER,
ZMQ_USE_FD, ZMQ_TCP_MAXRT, ZMQ_TCP_TOS
- Only cosmetic changes to the content
- These changes already merged on api.zeromq.org by me

Problem: multiple issues with zmq_sendiov/recviov

Solution:
- Add check for the [count] parameter in zmq_sendiov() and zmq_recviov()
- Use and add test for zmq_sendiov() in tests/test_iov.cpp
- Add error state tests for zmq_sendiov() in tests/test_iov.cpp
- Add error state tests for zmq_recviov() in tests/test_iov.cpp
- Cleanup tests/test_iov.cpp for style, consistency and clarity
- Generally improve test coverage for both API methods

Hat-tip:
@somdoron, @bluca

Solution: fix it

Problem: style issues in decoder.hpp

Solution: fix it