Update with correct param name.
Require Mercator 0.3.3.

The reason for this is that this is the first version where there are
guarantees that the rounding method used in all calculations is uniform,
both within a process and between various platforms. Previous versions
didn't guarantee this.
Handle missing entities.

This can happen if there's a transient entity, which is referenced but
not persisted.
Handle server errors better.

Report them and then continue on with trying to create the next entity.
Provide better import stats.
Fix issue with cancel not always working.
Use new Commune op for mind export.
Use new Think op and various cleanups.
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.
Remove some attributes when persisting.

These are of no use when the entity shall be restored.
Store minds in deterministic fashion.
Refer to goals through their ids.

When interacting with specific goals these are now referred to by their
id. This is obtained by first sending a Commune op with "goal" specified
as an attribute.
This way is much more preferrable to having to involve the "subject",
which is an Interlinguish specific construct which doesn't really have
any relevance to direct goal manipulation.
Add info on whether ids are preserved.
Use Ogre 1.9

 - OverlaySystem is now a component, add to build and initialize it in OgreSetup
 - Scene Managers can retrieve the OverlaySystem from OgreSetup and
   register it with themselves to show overlays.
 - Add some implemented methods due to Ogre interface changes.
 - Purge includes of OgreProgressiveMesh since it was removed.
 - TODO: use QueuedProgressiveMeshGenerator from Ogre. Current state
   throws some cast exceptions in the background.