os.system to subprocess and PEP8
require a Shell (because of Windows)
Update test_SeqIO_online.py for NCBI GenBank change

pass "gbwithparts" instead of "gb" as rettype to Entrez
for GI:16130152, forcing Entrez to return the complete
genbank record. This record was recently to omit the
protein sequence when queried with rettype="gb".
Thank Phillip in NEWS file
universal new lines and shell not on win32