WARNING: massive refactor to follow libomv's latest changes regarding inventory folders. The newest version of libomv itself is committed here. Basically, everything that was using the AssetType enum has been combed through; many of those uses were changed to the new FolderType enum.

This means that from now on, [new] root folders have code 8 (FolderType.Root), as the viewers expect, as opposed to 9, which was what we had been doing. Normal folders are as they were, -1. Also now sending folder code 100 for Suitcase folders to viewers, with no filter.
All tests pass, but fingers crossed!

OpenSim/Region/ClientStack/Linden/Caps/Tests/WebFetchInvDescModuleTests.cs

@@ -116,7 +116,7 @@ namespace OpenSim.Region.ClientStack.Linden.Caps.Tests
             PollServiceEventArgs pseArgs;
             userCaps.TryGetPollHandler("FetchInventoryDescendents2", out pseArgs);
             req.UriPath = pseArgs.Url;
-            req.Uri = new Uri(req.UriPath);
+            req.Uri = new Uri("file://" + req.UriPath);
 
             // Retrieve root folder details directly so that we can request
             InventoryFolderBase folder = scene.InventoryService.GetRootFolder(ua.PrincipalID);
@@ -137,6 +137,8 @@ namespace OpenSim.Region.ClientStack.Linden.Caps.Tests
             req.Body = new MemoryStream(OSDParser.SerializeLLSDXmlBytes(osdReqMap));
 
             TestHttpClientContext context = new TestHttpClientContext(false);
+
+            // WARNING: This results in a caught exception, because queryString is null
             MainServer.Instance.OnRequest(context, new RequestEventArgs(req));
 
             // Drive processing of the queued inventory request synchronously.