Preferences window
    This window is used to control user preferences. It displays 5 tabs 
    to change the preferences for different functions. The bottom buttons
    are avalilable for all the tabs :
      
        - The "Cancel" button closes the window without applying the changes.
        
- The "Reset" button resets the values to their "factory defaults" 
          values.
        
- The "Apply" button saves the changes in the user preferences 
          database.
        
- The "OK" button saves the changes and closes the window.
      
The first tab contains the general preferences.
    
    
 
      
        - The "Adjust sizes for Fourier transform" checkbox, allows
	Lynkeos to adjust the sizes set by the user to near values for
	which the Fast Fourier Transform algorithm is better optimized
	(namely, with only 2, 3, 5 and 7 as prime factors).
 If you uncheck it, Lynkeos will not alter your entry, but the
	processing will be slower.
The second tab is dedicated to the aligning preferences.
    
    
 
    
	- The "Align frequency cutoff" is a threshold used to avoid aligning 
          on some not so random noise.
        
- The "align precision threshold" is the maximum amount of alignment 
          offset "indetermination". Above that threshold, the alignment is 
          failed.
        
- The "Image updating during process" checkbox, controls whether the 
          images are displayed in the image frame when aligned.
 It speeds a bit the alignment when unchecked.
- The "Multiprocessor optimization" controls what kind of
	optimization is performed on multiprocessors computers (and has no 
	effect at all on monoprocessor architectures 
	 ). ).
 
	    - "No optimisation" : the algorithms are the same as on 
	    a monoprocessor ; it is slower but needs less memory.
	    
- "Parallel Fourier" : the Fourier transform of each
	    image is parallelized. It needs not much more memory but is
	    only marginaly faster.
	    
- "Parallel list processing" : each CPU process a
	    different image. The processors use is the most efficient but
	    the memory need is multiplied by the number of processors
	    (which should not be a problem anyway).
	
 As the tooltip for this control says "Don't change this unless you 
	know what you're doing".The third tab gathers the analysis preferences.
 
  The first two preferences affect only the "power spectrum" analysis. The first two preferences affect only the "power spectrum" analysis.
        - The "analysis lower frequency cutoff" is the "blur" frequency 
          threshold.
        
- The "analysis upper frequency threshold" is the "noise" frequency 
          threshold.
        
- The "Image updating during process" checkbox, controls whether the 
          images are displayed in the image frame when analysed.
 It is pretty useless and slows down the analysis when checked.
	  But you're free do do what you want.
- The "Multiprocessor optimization" has the same meaning as for
	aligning, with the exception that the "Parallel Fourier" option is 
	only applicable to the power spectrum analysis.
    
 The fourth tab controls the preferences affecting the stack
    functionalities.
 
   
        - The "Image updating during process" checkbox, does the same as 
	in analysis, and is no more useful.
	
- The "Multiprocessor optimization" has the same meaning as for
	aligning ; there is no "Parallel Fourier" choice, as it is not
	applicable here (there is no Fourier transform during the stacking).
    
 The last tab allows to change the preferences for the process
    phase.
 
   
	- The "Multiprocessor optimization" has the same meaning as for
	aligning ; there is no "Parallel list processing" choice, as 
	there is no list here.
    
 Troubleshooting ...