Corrected button usage so XENPV is only installed  when selected.

v 1.0.3 3/04/2013
- Corrected the behaviour where XENVP was installed  even when not
selected
( Set the Condition = CHECKBOXVIRTIO=1 and CHECKBOXXENPV=1  on
properties
of virtio.zip and xenvp.zip )
Bumped version to 1.0.0.2 and date.
Clarify "No Configuration" message in log