Change wget usage to make option handling easier
Switch all usage to $WGET, then set WGET in CONF.sh
First usage is to add --ca-directory /etc/ssl/ca-debian/ so https
certificates work.
+ Fix code extracting the xorriso version.
+ tools/apt-selection: pass APT::Architectures:: when calling apt;
otherwise if we're running on a multi-arch system apt will break
+ Factor out the xorriso version-checking code
Steve McIntyre