[Biopython] gff3 problem

[Brad Chapman]

Peter;

[SeqFeature support for not-stranded elements]
> So was the consensus that we should reword the Bio.SeqFeature
> docstring so say the four valid values for strand are (with GFF3
> equivalents in brackets):
> 
> +1 = Forward (+ in GFF3)
> -1 = Reverse (- in GFF3)
> 0 = Not stranded (. in GFF3)
> None = Unknown (? in GFF3)
> 
> And should features on a protein sequence should then have strand 0?

That sounds great. I can make the corresponding change to the GFF
library. Let me know if there are any other roadblocks to
integrating that. Thanks much,
Brad