Fix error with message template incompatibility for LinkInventoryItem.Merging...

Fix error with message template incompatibility for LinkInventoryItem.Merging newinventorymsg__merge__viewer-2.0.0-3__r131585 into viewer-2 trunk, see QAR-1804 and QAR-1805.

Merging revisions 131698-132325 of svn+ssh://svn.lindenlab.com/svn/linden/branches/avatar-pipeline/newinventorymsg__merge__viewer-2.0.0-3__r131585 into D:\viewer-2.0.0-3, respecting ancestry