Fixed memory leaks.
Moved AtlasObjectDecoder to better place.
Fixed indent issue with maps in lists.
Store entities using Atlas.

Instead of using our own XML format. This makes it easier to implement
similar import functionality on the server, and handling the data within
the WF ecosystem in general.
Provide more informative logging.
Added option of not preserving ids.

If so the persisted entities will use generated ids. This is the
default.
Improve exporting.