Strip only /trunk/ from externals.

svn2cl-driver.sh

@@ -2,6 +2,6 @@
 svn2cl --authors authors.xml --reparagraph -o ChangeLog.new
 for i in alberta alberta_util demo doc add_ons; do
   cd $i
-  svn2cl --authors ../authors.xml --reparagraph -o ChangeLog.new
+  svn2cl --strip-prefix=/trunk/ --authors ../authors.xml --reparagraph -o ChangeLog.new
   cd ..
 done