make histogram zoomable, add tooltip, rationalise ticks
make histogram zoomable, add tooltip, rationalise ticks

tcspain/SynchWeb,tcspain/SynchWeb,tcspain/SynchWeb,tcspain/SynchWeb,DiamondLightSource/SynchWeb,tcspain/SynchWeb,tcspain/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb