Implementation of the SI-method for solving stiff boundary value problems

The release is intended to support the theoretical and practical results published in the article
"An efficient approach for solving stiff nonlinear boundary value problems" by V. L. Makarov and D. V. Dragunov.
It contains a c++ implementation of the SI-method for solving initial and boundary value problems for a nonlinear second order differential equation. The main advantage of the method is that by design it has an "immunity" towards rapid variations of the problem's solution, known as "boundary layers".

The solution contains separate unit test project which besides obvious testing purposes serves as a set of "how to" examples.