jochym/Elastic: 5.x series start

The new 5.0 version is API incompatible with the previous versions. It provides a new command line utility as the main user interface to the package - which hopefully will broaden the user base byond python users.

The new version also changes API of the library from mix-in class to the set of simple functions providing functionality of the module. The workflow of the package was also changed to prepare data - calculate - post-process style, which is better suited to serious research work.