Description of problem:

The "Retrieving Software Information" dialog needs a cancel button. If the user
opens pirut by mistake it can take a long time to get this information before
the user is able to close pirut. Also, if the "List" tab is clicked in error, it
can take a long time to open this dialog.
  
Actual results:

No cancel ability provided

Expected results:

Ability to stop the retrieval of software information and either close pirut or
return to the previous screen.