Added the ability to put a cursor on the plot inside of AMScanView.  It can be added to AMScanViewExclusiveView and AMScanViewMultiView.  The cursor can be moved programmatically or from clicking the mouse, but currently the visibility is only toggle-able programmatically.
Merge branch 'newXRFDetector' of github.com:acquaman/acquaman into newXRFDetector