Removed "hacktastic" code that is no longer needed.

We no longer set the object's AbsolutePosition in this place, so the IsAttachment hack doesn't do anything anymore.

This resolves http://opensimulator.org/mantis/view.php?id=6936
Better error messages

This resolves http://opensimulator.org/mantis/view.php?id=6936
Get the full viewer name even if it's (incorrectly) sent in the 'Channel' field

Recent versions of Firestorm and Singularity have started sending the viewer name in the 'Channel' field, leaving only their version number in the 'Viewer' field. So we need to search both of these fields for the viewer name.

This resolves http://opensimulator.org/mantis/view.php?id=6952
Enable runprebuild.bat to run in Cygwin

This resolves http://opensimulator.org/mantis/view.php?id=6951
Updated Prebuild to support .NET 4.5

Resolves http://opensimulator.org/mantis/view.php?id=6951
Changed to Unix line-endings in VS2010Target.cs

Resolves http://opensimulator.org/mantis/view.php?id=6951