python: Support quick key signing.
* NEWS: Update. * doc/gpgme.texi (gpgme_op_keysign): Fix the description of the 'expire' argument. * lang/python/gpg/constants/__init__.py: Import new file. * lang/python/gpg/constants/keysign.py: New file. * lang/python/gpg/core.py (Context.key_sign): New function. * lang/python/tests/Makefile.am (py_tests): Add new test. * lang/python/tests/t-quick-key-signing.py: New test.
- Signed-off-by: Justus Winter <justus@g10code.com>