Blasts against pdbfinder are missing residues

[jonblack]

The BLAST results from pdbfinder are missing residues. See cmbi/hommod#41.

[cbaakman]

Most likely the problem is in https://github.com/cmbi/mrs/blob/master/parsers/pdbfinder.pm#L117. The regular expression matching assumes that sequences contain only letters, no dashes.

We must think about what to do with line breaks. Completely ignoring them in blast might not be scientifically correct.