Produces a plot on the active graphics device and returns a three
component list object:
hits
an ordered matrix detailing the subset of hits with a normalized
score above the chosen cutoff. Database identifiers are listed along
with their cluster group number.
acc
a character vector containing the database accession identifier of
each hit above the chosen threshold.
pdb.id
a character vector containing the database accession identifier of
each hit above the chosen threshold.
inds
a numeric vector containing the indices of the hits
relative to the input hmmer object.