Instead of generating the list of message ids anew during every build, the file is generated manually and committed into the repository. Also, the list of defines is stored in id128-defines.h, also kept in the repository. Both files should only grow. This should make build easier. But it also fixes a problem with systemd, which occasionally drops message definitions. We will keep them forever, so it should be safe to rely on the presence of message definitions which systemd does not use anymore. Fixes #23.
This somewhat breaks backwards compatibility, but not for the previously documented arguments: floats are now interpreted differently, but ints and datetime.datetime objects are interpreted the same as before. But the documentation clearly stated that only ints and datetime.datetime objects were allowed. This makes seek_realtime match seek_monotonic and other functions which take time and follows the principle of least surprise. Fixes #21.
Let's pass any flags through to the journal functions without checking validity. Those functions do their own checking, so there's no need to second-guess. The semantics for _Reader(flags=0) are a bit changed: before, this would be transformed into sd_journal_open(SD_J_LOCAL_ONLY). Now, this results in sd_journal_open(0). Previous behaviour should be achieved by not specifying the flags at all. This change is necessary, because previously it was not possible to pass flags=0 to sd_journal_open(0), i.e. it was not possible to "merge" journals through the Python interface. Similarly, Reader(flags=0) now means to open all journals, and Reader(flags=None) is the same as Reader(flags=LOCAL_ONLY).
Those are field names and they should always be ASCII, and converting them to str automatically makes the answer more useful.
Wrapping the sources to ~80 columns means that the formatted output is annoying to read. Rewrap to ~74 columns in the output. Also remove some obsolete descritions of journal permissions and refer to journalctl(1) instead. Add some missing docstrings.