Fix for fetchone() and fetchmany() in Python interface

This patch fixes the well-known but unfixed bug that fetchone() always returns
the first result in the DB-API compliant wrapper. It turned out that the bug
was way down in the C code.

Gerhard
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reduce(lambda x,y:x+y,map(lambda x:chr(ord(x)^42),tuple('zS^BED\nX_FOY\x0b')))