[Therion] shift for extended scraps

[Martin Sluka]

I used shift for scraps with projection map. No problems.

I tried to use shift for scrap with projection extended. The result is:

therion: error -- milada.th [65] -- shift is not allowed for scrap -- 
milada_ext_s8 at milada

Definition of map is as follows:

map milada_ext.map -projection extended
  milada_ext_s7 at milada #pritokova chodba
  break
  milada_ext_s8 at milada [0 -10 m] below
  break
...

Is there any workaround or did a mistake there?

Thanks

Martin s.