This change will allow using the new public APIs concerning root
solvers, optimizers, ODE integrators, linear algebra, geometry,
statistics and error handling. It also solve numerous bugs, some of
them affecting Orekit. Vesion 2.2 is considered obsolete now.

Synchronizing major releases for both Apache Commons Math and Orekit
is also much simpler for users, who will not feel the pain of two
successive changes.