PixTestPattern - added histos on the gui!

-print out of histos on the gui added
   it works only if 'binaryoutput==0' (decoded readout needed to fill the histos).
   still issue with 'Clear' button to be fixed.
-arranged the decoded printout on the file
   now only 200 events printed to not take too long.
   if you need the whole buffer just select 'binaryoutput==1' and results on file.