Linear algebra wrapper

[EvenSol]

A number of linear algebra libraries are used in NeqSim. The currently most used linear algebra library in NeqSim is EJML (because of speed). Examples of such libraries are JAMA, EJML, ojAlgo, commonMath, etc. To reduce the number of libraries used (eg. standardize on EJML), and make it easy to change to another library, a linear algebra wrapper could be made in NeqSim. This will improve flexibility and reduce number of dependencies.