This patch implements llMessageLinked. I had to make a change to llGetLinkNumber to return m_host.LinkNum + 1 for link sets of more than 1 prim, or 0 for a single object, since according to: http://rpgstats.com/wiki/index.php?title=LlMessageLinked linksets with 2 or more prims start the link numbering at 1, but a single prims link number is 0.