Removed bugs from NemhauserUllmannSolver
Removed bugs from NemhauserUllmannSolver

There were two bugs. The first was in noBetterPointsExists. There are two spots
in which these function is used. In one we need the negation.

The other bug was sitting in the copying of KnapSackItems.

I also forgot to reset cLPrime_i.

Test is passing now.

vimaier/hpc-knapsack,vimaier/hpc-knapsack