Replace external library armadillo with either self-written or more common one.
Currently, the pXCP code often uses the Armadillo library for handling matrix data. However, the actual functionality of this library is rarely used, usually just simple matrix algebra (addition, multiplication, ...) or finding the mean value. At the same time, it adds complexity to the compilation process. Hence, it should be replaced by simpler, self-written code snippets, or a more common library.
Little priority!