Avoid a deadlock where a script can attempt to take a ScriptInstance.m_Scripts lock then a lock on SP.m_attachments whilst SP.MakeRootAgent() attempts to take in the opposite order.

This is because scripts (at least on XEngine) start unsuspended - deceptively the ResumeScripts() calls in various places in the code are actually completely redundant (and useless).
The solution chosen here is to use a copy of the SP attachments and not have the list locked whilst creating the scripts when an avatar enters the region.
This looks to address http://opensimulator.org/mantis/view.php?id=6557

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