* modified ZmqSocket to expose the SO_RCVBUF and SO_SENDBUF parameters. Modified DataStreamer.cpp to change the SENDBUF to 1MB when HWL is <10. Modified Datastreamer.cpp so that when HWL is changed, socket is unbind/rebind. Added rebind to ZmqSocket.cpp.
Changed slot UpdatePlot() in qdrawplot.h from privat tto public, added plot->UpdatePlot() after every axis range change, so the plots are updated immediatly and not at the next image.
Added onlinedisp_zmq program which connects to the receiver ZMQ port and show images and histos. Compiled against ROOT 6.22/02. Added examples files.
* added setbuffer size also for gui, moved hardcoded values to a macro, removed unnecessary return of ok or success, added actual zmq exception message to could not create sockets error
* zmq: changing buffer size done within hwm
---------
Co-authored-by: mozzanica <l_mozzanica@mpc2012.psi.ch>
Co-authored-by: Dhanya Thattil <dhanya.thattil@psi.ch>
