Relative path resolutsions:
- global keydir is relative to global storage dir
- zone storage dir is relative to global storage dir
- zone keydir is relative to zone storage dir

Based on patch from Kamil Sopko <kamil.sopko@savana.cz>

refs #167

Set to 10800s (see reasoning in issue #155).

refs #155

It is probably inconsistent, just leave it there as it is.

refs #167

refs #145

refs #145

* evsched now uses common errcodes instead of magic values
* updated tests

refs #145

If the journal gets full during changesets saving, it is flushed
(the zone file is updated), and the changesets are saved again.

refs #167

CID #1134442

fixes #163