Merge pull request #37 from z2v/master

Collect tests in separate tree in the root of the repo
Sort auxfns in output to simplify testing
Fix roaming test failure on Python

Tuples were sorted by first item with order preserving in case of equal
values. This resulted with failure, when order differed. Now sort by
both items.
Extract building code from Dopri and Radau
Drop __del__ methods

Let GC do it's work