A hakish implementation of  ZMQMGContext with single module global zmq_ctx 

This allows mixing php  threads with zeromq over the cheapest transport inproc://   allowing code like:
````
$zmq=new ZMQMGContext (1,true);
$mainsok=$zmq->getSocket(ZMQ::SOCKET_REP);
$mainsok->bind('inproc://talktomain');

class TestThread extends Thread
{
	public $param;
	public function run(){
		
		$zmq=new ZMQMGContext (1,true);
		
		
		$tomain=$zmq->getSocket(ZMQ::SOCKET_REQ);
		$tomain->connect('inproc://talktomain');
		$tomain->send(.......);
.......
		$rep=$tomain->recv();
	}
}
````