Bug fixing part II

Some bugs were fixed from the last session like: wrong undo/redo naming on rectangle, box modifier is changed to be defined with a dialog (is experimental for now, probably fixing the current SVN action may remove this dialog), disabling current action may not lead to set the action None and the help is not changed, visible selection for boolean operations and switching to None right after, gp_Pnt class is not visible from debugger, the code was changed in most places with a C# implementation (Point3D class), installer works again,