* 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.
Signed-off-by: Tobias Mueller <muelli@cryptobitch.de>