[patch] Change assert to a detailed warning and abort

[John (J5) Palmieri]

Now that Gnome-VFS has started to use D-Bus and is heavily threaded
people have been running into the allocator->lock == mutex assert a lot.
This is due to them not initializing threads early in the game usually
as a side effect of loading Gnome-VFS through a plugin.  

This patch changes the assert to be a more detailed warning and an abort
since it is a user error an not the fault of the library itself.  Is
this the right way to handle this or is there a better way?  Also read
over the verbiage to make sure it is clear.  Thanks.
   
-- 
John (J5) Palmieri <johnp at redhat.com>
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