Fixed ridiculous off-by-1 bug in _terminal_dist2() .
Debugging changes in _make_genbank_gene_terminii().
Preliminary code in  _make_genbank_gene_terminii() to handle cases where the start of a gene has been pseudogenized resulting in false upstream exon fragments.
  _make_genbank_gene_terminii() code to iteratively remove short 5prime exons added.
  _make_genbank_gene_terminii() code to iteratively remove short 5prime exons corrected.
Added prune_fiveprime_exon() to enable removal of suspect upstream exons while retaining an intact reading frame.
_make_genbank_gene_terminii() : abstracted a bunch of work to Orf::prune_fiveprime_exon(), added documentation and cleanedup output.
_method() now returns only unqualified method name (no package etc).
_genbank_quality_filter() reorganized to allow removal of some genes but hiding of others form genbank_tbl routine. genbank_tbl moddified correspondingly.
_make_genbank_compatible() reversal of debugging changes.
genbank_tbl() output tweaks for debugging.