python-systemd: Reader return special fields and _Reader changes

Changes to _Reader make it match closer to C API, by removing `get_next`
and `get_previous`. A `get_all` method added, which returns dictionary
of fields using C API SD_JOURNAL_FOREACH_DATA macro, which can be used
in conjunction with `next`.

_Reader `get`, `next`, `get_{realtime,monotonic,cursor}` and new
`previous` methods are made private. This is so the traversal and
getting of journal fields can be made transparent in the python
interface.

Reader now solely implements `get_next` and `get_previous`, returning a
standard dictionary (future: other mapping types?) with all standard and
special fields through the converters. This makes the output the same as
journalctl json/export format output.

Iterator methods also moved to Reader, as they do not function as intend
with changes to _Reader.

These changes also mean that more optimised journal interfaces can be
made more easily from _Reader, by avoiding getting of unrequired fields
by using the `_get` method, and avoiding field conversions.

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