lib/rinda/tuplespace.rb: Only return tuple entry once on move,
either through port or regular return, not both. This results in a
120% speedup when combined with #8125. Patch by Joel VanderWerf.
[ruby-trunk - Feature #8119]
Feature #8119: more efficient version of Rinda::TupleSpaceProxy.take
Bug #8125: lost-tuple bug and fix for Rinda::TupleSpaceProxy.take