Tcp get address

Windows build

Needs explicit cast on solaris

Fix build on solaris

Remove thread safe socket code from C API and tests.

Removing old ECANTROUTE documentation

Revert null checks in the API

Adding more specific installation instructions

Minor cleanups

* Fixed use of ssize_t in zmq_msg_t class
* Corrected error after merge, old reference to inner_fctname (broke build)

Return EFAULT if required arguments are null

Renamed scatter/gather methods, cleaned up source

Remove inet_ntop

Compact the trie/mtrie node tables where possible, to reduce memory usag...

Drop subscription messages when reaching the SNDHWM rather than assertin...

Resolve addresses in the calling thread on connect.

Added zmq_msg_send/recv functions

Renamed zmq_getmsgopt to zmq_msg_get

Signed-off-by: Staffan Gimåker <staffan@spotify.com>