Re-enabled ZeroWindow and added early cut due to parent beta-cutoff

ZeroWindow was commented, fixed. If a Split point has detect a
beta-cutoff, its childs are now informed to abort the search, without
destroying TT.
Merge branch 'master' of git@github.com:eldr4d/parallel2048.git

Conflicts:
	Client.cpp
	NegaScout/Search.cpp
	NegaScout/Search.hpp
Found a way to replace a printf

lib iomanip was the solution, C++11 friendly :)