Add Expectation Maximization to solve the inverse problem in obtaining an AED from the experimental isotherm data

[jbreue16]

If one is interested in obtaining an AED from the experimental isotherm data, a specialized algorithm called Expectation Maximization (EM) method is available to solve the inverse problem. The EM method is an iterative method based on simple algebraic operations and is independent on other functionalities of CADET. For it to be part of the CADET family, we need a dedicated simple module that can be called by the user.

See #295 for further information.