python: Fix reading data from existing files.
* lang/python/pyme/core.py (Data.__init__): Add 'copy' kwargument, and pass it to functions supporting it. PEP8 fix. (Data.new_from_fd): PEP8 fix. (Data.new_from_file): Give a more helpful error message if copy is False. PEP8 fix. (Data.new_from_fd): Hand the file descriptor to 'gpgme_data_new_from_fd', not a stream. Fix docstring. * lang/python/tests/t-data.py: Add tests for this.
- Signed-off-by: Justus Winter <justus@gnupg.org>