This tools are for srf simulations with the following features:
1. adding type= 4 ltc type: vacuum
2. adding an is_srf on the last of an type= -1 or 1

format:
vacuum: type x y z
atom: type x y z is_srf
vcc: type x y z ix iy iz
itl: type x y z ix iy iz dir head

1048576
T: 500000 1.204
4 0 0 0
1 0 0 1 1
-1 0 0 2 0
-2 0 0 3 0 0 1 3 -1
3 0 0 4 0 2 0 5 -1
0 0 0 5 1 0 1
...