v1.4 (Release Candidate 4)

(1) The Histogram chooser includes icons to mark those histograms that contain gates. They are a "gates present but not all defined" icon, and a "gates present and all defined" icon. (2) The selection toolbar at top and the action toolbar at the side, can now be dragged away from the main window to make more room for the plot. (3) HDF I/O classes have been refactored to make more use of the Java Collections API, specifically Maps, which makes the code more readable, and (at least theoretically) improves HDF I/O speed.