python: Default whence argument for Data() to SEEK_SET.
3cf9aedc92b6
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python: Default whence argument for Data() to SEEK_SET.

* lang/python/gpgme.i: copied signature from gpgme.h and defaulted the
value to SEEK_SET.
* lang/python/tests/t-data.py: Added a test for no second argument

Having to import the os package when wanting to read a Data object is a
slight annoyance. With SWIG, we can define default parameters. This
change defaults the whence argument to SEEK_SET which is how StringIO
and BytesIO behave.