[Biopython-dev] Small fix to MutableSeq

[Brad Chapman]

Hey all;

Just a friendly heads-up to let you know that I fixed a small bug in
MutableSeq. This was the same array.array() initializer bug we saw
before, but I caught it in __setslice__ this time. 

I also added some tests for MutableSeq to the test_seq class, as part
of my continuing attempts to turn myself into an Extreme Programmer
extraordinaire :-)

Brad