Use 7z to create the .zip file instead of jZip.

Reason: jZip inserts an advertisement file into the .zip
archive, while 7z doesn't seem to.

createDistribution

@@ -76,6 +76,6 @@ cp include/snfmultidll.h include/snfmultidll.h.html $DirName/include
 
 # Create the zipfile.
 rm -f $ZipFile
-jzip -p -r $ZipFile $DirName
+7z a -tzip $ZipFile $DirName -r
 
 echo Created zipfile $ZipFile