Initial work on viewer motion interpolation. Changes include:

* InterpolationTime and InterpolationPhaseOut values in settings.xml to control new object interpolation code.  Use zero to revert to old logic
* Viewer motion interpolation lasts InterpolationTime and will start to phase out after InterpolationPhaseOut seconds
* Changed LLWorld::getMinAllowedZ() to take a world-position as a parameter
* Added LLVOAvatarSelf::resetRegionCrossingTimer()
* Actually reset LLVOAvatarSelf::mRegionCrossingTimer so we get sensible timing data for region crossings
* LLVOAvatarSelf::updateRegion() will update position value due to region changes
Code reviewed by Ambroff

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