[TDF] Keep alive tdf013 tutorial also in batch mode
[TDF] Keep alive tdf013 tutorial also in batch mode

protecting accesses to the pad. This is done to guarantee a good
experience to the user and to be able to run the tutorial as a test.

A line of documentation is added to the the description of the example too.

zzxuanyuan/root,zzxuanyuan/root,karies/root,karies/root,olifre/root,root-mirror/root,karies/root,karies/root,root-mirror/root,olifre/root,zzxuanyuan/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,zzxuanyuan/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,olifre/root,karies/root,root-mirror/root,karies/root,zzxuanyuan/root,olifre/root,olifre/root,zzxuanyuan/root,olifre/root,olifre/root,karies/root,zzxuanyuan/root,zzxuanyuan/root,olifre/root,zzxuanyuan/root,karies/root,karies/root,zzxuanyuan/root,olifre/root