Commits on Jan 29, 2020

1. Fix Sync issues with FuturesUnordered …

   This updates non-mutable FuturesUnordered methods to be thread-safe,
   ensuring that Sync trait requirements are met without breaking existing
   functionality.
   
   The FuturesUnordered::link method used by FuturesUnordered::push has
   been modified to use atomic operations to allow for lock-free insertion
   of new futures while still allowing FuturesUnordered::iter and
   IterPinRef itself to operate simultaneously. FuturesUnordered::len has
   been removed, with each Task now storing a snapshot of the list length
   at the time when the future was added, so a synchronized list length can
   always be read after an atomic load of FuturesUnordered::head_all. This
   increases the memory overhead of each task slightly, but it allows us to
   retain the original iterator behavior without dramatically increasing
   the performance cost.
   
   Operations that require mutable FuturesUnordered access have not been
   made lock-free, with direct mutable access to otherwise atomic values
   used when possible to avoid unnecessary overhead.

   

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