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.
No cancel ability provided
Ability to stop the retrieval of software information and either close pirut or
return to the previous screen.
Cancel button will be present with pirut 1.3.11