[BioPython] Trying to transcribe RNA = error?

[Peter]

I wrote:
> Unless anyone speaks up, I will side with Sebastian and add a check to
> the  Bio.Seq.transcibe() method to reject RNA sequences, and a similar
> check on the Bio.Seq.back_transcibe() method to reject DNA sequences.

This change is now in CVS, Bio/Seq.py revision 1.13

Peter