SearchFill
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The example search for vacancies in a crystalline sample with missed atoms.

1.- Use a random.control to remove atoms randomly on a crystalline tungsten crystal. 
    lpmd-converter random.control
2.- Generate a new lpmd file with the removed atoms
    comm -2 -3 <(sort tungsten-crystal.lpmd) <(sort tungsten70p.lpmd) > removed.lpmd
    Edit the removed.lpmd to do a right-format lpmd file.
3.- Search for the vacancies using
    lpmd-converter saf.control
4.- Compare or mix the removed.lpmd with the V atoms in the final-reconstructed.lpmd 
