+* Passing command line arguments to external commands.
+
+Any option taking a command name as its argument now accepts a full
+command line as well. Thus, it is now possible to pass additional
+arguments to invoked programs. The affected options are:
+
+ --checkpoint-action=exec
+ -I, --use-compress-program
+ -F, --info-script
+ --to-command
+
+Furthermore, if any additional information is supplied to such a
+command via environment variables, these variables can now be used in
+the command line itself. Care should be taken to escape them, to
+prevent from being expanded too early, for example:
+
+ tar -x -f a.tar --info-script='changevol $TAR_ARCHIVE $TAR_VOLUME'
+