[BioPython] similarity and string alignments

[Geraci Filippo]

Hey,
I'm working in DNA fragment assembly. Using BioPython I've not found a 
librery implementing similarity and string alignments.

I wrote a C library to provide local,global and semiglobal similarity 
and build each possible string alignment and I wrote the extension for 
python.

I'd like to know if these functions already exist and I lose my time or 
otherwise how to contribute to biopython project

regards

Filippo