Applying Joshua's fix.

* Support group members with the right powers buying land set for sale to a group
* Add dialogs for abandoned land related notifications.

EXP-777 WIP [crashhunters] crash in LLWind::decompress
added NULL check

(Reverted change back to original behavior - needs attention later)

flys avatar to end point but avatar spins and shakes when arriving at click point.

fixing merge error

EXP-789 Reducing size of sound device panel in Basic Mode does not resize elements in the panel and allows panel to be smaller than elements it contains

ignore button reordering in basic mode
use preferred button collapse order

This library was only needed on the Mac, and only with the OS X 10.4 SDK. As
of October 2010, we no longer build the viewer with that SDK. The 10.5 SDK
we're currently using directly supports the functionality for which we
originally brought in Pth.