The 2 columns of the History list are now of the same width, can't be

resized, and display a tooltip.

The ICM tool has been reworked to avoid loosing space.

The curve's histogram are now displayed.

For Windows users, if you can't build the Gtk3 branch anymore with your
Gcc5.x compiler, try to uncomment line 20-21 of the main CMakeLists.txt.
For some reason, I had to comment that out.

rtgui/history.h

@@ -74,7 +74,6 @@ public:
 
 protected:
     Gtk::VPaned*            historyVPaned;
-    Gtk::ScrolledWindow*    hscrollw;
     Gtk::TreeView*          hTreeView;
     Glib::RefPtr<Gtk::ListStore> historyModel;
 
@@ -93,6 +92,8 @@ protected:
     ParamsEdited defParamsEdited;
     int bmnum;
 
+    bool on_query_tooltip(int x, int y, bool keyboard_tooltip, const Glib::RefPtr<Gtk::Tooltip>& tooltip);
+
 public:
 
     History (bool bookmarkSupport = true);
@@ -120,7 +121,7 @@ public:
     void addBookmarkPressed ();
     void delBookmarkPressed ();
 
-    void resized (Gtk::Allocation& req);
+    //void resized (Gtk::Allocation& req);
 
     void undo ();
     void redo ();