Bug fixes deployed to grid servers

A number of bug fixes have been deployed to the grid servers. 

This corrects an issue with sit target where avatar would hover about 10 cm over the item sat on. It also aligns sit behavior with SecondLife. 

In addition there are fixes for landmarks not being created in the Suitcase folder during a hypergrid visit, improvements to osRegionRestart, a fix to the asset server where object that are being deleted cannot be copied to a foreign asset server at the same time, and a check for HomeURI and GatekeeperURI back ported from arribasim. 

Finally parcel transfers now behave predictably where parcel title and description is updated in the viewers, and parcel sounds will play when crossing parcel borders. 

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