Changeset 10142 for branches/DataAnalysis.IslandAlgorithms/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/EnumerableItem.cs

#1997: Worked on symbolic data analysis island algorithms:

• Refactored and removed unnecessary code in symbolic island GA and symbolic island GA evaluator.
• Added EnumerableItem to ease the passing of rows to the actual evaluator.
• Added prototype of island offspring selection GA.
• Corrected build configuration (plugin classes, project settings, ...)