- Use gevent.sleep with a tiny value after a message has been
received instead of no call to sleep at all. This was the
reason for the webserver to block when used with prep8
and the leiden dil with a lot of data
- move gevent.monkey.patch_all() to secop-webserver
- properly close clients
main change: the same server may be used for several instruments
- client classes are 'Interactors' dealing with the parameters etc.
- methods from history are added to the clients
+ improvements on the js client side