change lammps2pdb.pl to only ignore the first line of a data file. whitespace fixes

    foreach ((masses,atoms,bonds,angles,dihedrals,impropers)) { $hash{$_}=$_; }

    open(DATA, "<".$data_name);

    for (my $i=0; $i<2; ++$i) { my $tmp = <DATA>; }	# skip first two lines

    my $tmp = <DATA>;                                   # skip first line

    while ($init&&!eof(DATA))                           # interpret header

    {

      @tmp              = split(" ", <DATA>);