change Lammps mainfile_contents_re

Closes #1276 (closed)

@ladinesa - I changed the Lammps regex matcher to include the data after. Typical log file looks like this: LAMMPS (12 Dec 2018). Not sure if this is completely general, but it works for all the test data I can see, and it avoids the other files which simply print "LAMMPS" at the beginning of the line in the header.

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