Most of the icons were derived from the following SVG's placed into
the public domain in openclipart:

Derived from those designed by Architetto Francesco Rollandin:
   install:     computer/buttons/tasto_2_architetto_franc_01
   installBox:  computer/buttons/tasto_2_architetto_franc_01
   remove:      computer/buttons/tasto_8_architetto_franc_01
   removeBox:   computer/buttons/tasto_8_architetto_franc_01
   out-of-date: computer/buttons/tasto_10_architetto_fran_01
   up-to-date:  computer/buttons/tasto_10_architetto_fran_01
   check:       computer/buttons/tasto_7_architetto_franc_01

Derived from one designed by Juliane Krug:
   package:     containers/box_juliane_krug_s
   suite:       containers/box_juliane_krug_s
   group:       containers/box_juliane_krug_s

Inkscape was used to edit all the above into their current forms, and to
create the SVG images.  It also was used to resize all SVG's to around
108.6pts.
