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Problem: autoconf-archive m4 macros out of date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:
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

problem: no documentation for Radio-dish and UDP

Problem: relicense statement from imatix is in the wrong place

Solution: move the statement to the folder introduced in commit:
dd51cad0

Problem: need to collect grants to relicense under MPLv2

Naos Ltd license grant/quitclaim

RELICENSE: Start collecting MPLv2 license grants

Problem: libzmq lacks a good doxygen config

Solution:
- Add Doxygen.cfg file to make it simpler for library users and interested
parties to view library internals/externals
- Add README.doxygen.md as an Overview for Doxygen-generated documentation

Notes:
This could later be added into CI for autogenerated documentation that could be
posted to the gh-pages branch.

Problem: unistd.h redundantly included twice

Problem: test_pub_invert_matching missing in autotools build

Solution: fix it