Beam postion monitor replay for raster plots
A slimmed down version of the replay for rapidly looking at raster plots.
Also, here would be opportunity to think about a "control panel" for switching the type of monitoring replay. @cpeng @sly2j @whit should discuss ideas for this.
I am thinking about Mark or Dave wanting to move the beam around/ tweak the raster. They should be able to to check a switch and the replay switches to the fast bpm/raster replay script.