+ Merged and simplified the old functionality from scansources.old
and scanpackages.old into the new script create_control.
+ Run the mkisofs step *outside* of "set -e" so that we can actually
report errors instead of silently failing.
+ Split out the code for starting a new disc into a function.
+ Pick up on a potential bug: if we finish the last (expected) disc with
a backed-out file, make sure we create another image to include that
file too.
* Size-override code updates
* Make source DVDs fit better
* Add more checksum types to the generated Release files
* Tone down messages about missing include/exclude files
Steve McIntyre