version 2.23.3
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	* Added partial support for tar archives compressed with 7zip.  
	* Display the progress dialog if the operation lasts more than 5 
	  seconds.
	  Display the progress dialog without delay if extracting or converting
	  an archive.  After the extraction add to the progress dialog the 
	  button to open the destination folder and after the conversion add 
	  the button to open the newly created archive.
	  Removed the 'view folder after extraction' option from the 
	  extraction dialog.
	* Removed the preview-file stock item, use gtk_stock_open instead.
	* Do not use the sh command to exec the process, use the utility command
	  directly to allow to stop the process properly
	* Use g_io_channel to read the command output.