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Chess engine: Barbarossa 0.7.0 (Windows and Linux)

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Barbarossa - UCI chess engine
Author: Nicu Ionita  Rating CEDR=2588

v. 0.7.0:
This release is only a few Elo rated over the previous released version, but has a few improvements, a few of which make the play of the engine more stable:

implements selective depth (UCI)
implements minor promotions
corrections in search and quiescent search
new evaluation terms and better evaluation weights
improvements and optimizations in search and evaluation
a few small improvements in move ordering and pruning

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