[#LIBZMQ-446] Silence error on setting PGM_TOS on REL 4.

[#LIBZMQ-446] Silence error on setting PGM_TOS due to some platforms raising an error at runtime. Noted are RHEL 4.

MSVC local_thr & remote_thr dependency fix

Add platform.hpp as project dependency to vc100 and vc110 projects for local & remote throughput tests.

Use state functions for message flow

The patch makes the code somewhat simpler and prepares it for
more complex initialization handshakes.

Refactor code so that messages go through engines

Small clarification about connect and ROUTER

Adds a needed Windows system library dependency

MSVC fixes

Use Multithreaded DLL Runtime, Debug/Release accordingly - need consistency for the czmq configurations

mingw32 fixes

Fixed test_last_endpoint (#80)

Reverted cleanups of copyrghts

Optimize atomics implementaiton for the Tile architecture

For atomic_counter and atomic_ptr classes, detect the Tile architecture
using #if defined __tile__ matching ARM and Solaris and then use the
Tile atomic instructions. Without this change, the default Mutex
implementation is used, which is slower.

Work around for LIBZMQ-496

The problem is that other threads might still be in mailbox::send() when
it is destroyed. So as a workaround, we just acquire the mutex in the
destructor. Therefore the running send will finish before the mailbox is
destroyed.

See also the fix for LIBZMQ-281 in zeromq2-x.
Signed-off-by: Mika Fischer <mika.fischer@zoopnet.de>

Update PGM with recent changes

Fixed CMake building after encoder/decoder changes

Fixed copyrights in sources