Changes in `bracketing_to_hdr':

From 0.4.0 to 0.4.1:
===================
 - file "br_defs.hpp" introduced (contains BR_WITH_SHIFT); in "ShiftMenu.hpp"
     and "ShiftPanel.hpp" dummy classes now, if BR_WITH_SHIFT undefined
 
 - in Br.*pp
     o [virtual] functions `cursor_wait()', `cursor_default()' introduced
       to wrap the relevant computation calls by CURSOR_WAIT
  
 - in BrGUI.cpp: 
     o "BrGUI.f...()" calls corrected into f...()
 
 - class Fl_Cartesius:  
     o function `init()' removed (swallowed by Ctor)
     o current font saved in FL_ENTER and restored in FL_LEAVE
 
 - in Fl_Cartesius.hpp: virtual Dtor added to class `AxisInfo'
     avoids warnings due to abstract functions
     
 - in ProgressInfo.hpp: virtual Dtor added to class `ProgressInfo'; 
     avoids warnings due to abstract functions
 
 - in plugin_main.*pp: 
     function `cpaint_load_file()' renamed in `cpaint_load_image()'  
     
 - files types.hpp, types_plot.hpp renamed in br_types.hpp, br_types_plot.hpp
 
 - in TNT/tnt_i_refvec.hpp: typo "data" --> "data_" in `is_null()'
      
 
From 0.x.x to 0.4.0:
===================
 - Fl_Cartesius derived now from Fl_Group instead from Fl_Window
 - CCDCurvePlot removed, now only one "Response Curve" widget
 - ys_dbg.c, ys_dbg.h renamed in ys_dbg.cpp, ys_dbg.hpp
 - deactivation of "Analyze" items removed because the corresponding
   widgets are meanwhile (camera==0)-save

