always display the minor number as two digits. Examine the response
to the sign-on command to see which programmer hardware we are talking
to, and then restrict the STK500 topcard display to devices detected
as STK500.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@614 81a1dc3b-b13d-400b-aceb-764788c761c2