* function for the knapsack problem which returns one of the optimal subsets
* function for the knapsack problem which returns one of the optimal subsets
* function for the knapsack problem which returns one of the optimal subsets
* function for the knapsack problem which returns one of the optimal subsets
* function for the knapsack problem which returns one of the optimal subsets
* some pep8 cleanup too
* ENH: refactored longest common subsequence, also fixed a bug with the sequence returned
* renamed function