In the kernel tests cutoff of neighbourlist manager and of representation calculator are mismatched

[agoscinski]

In the tests the cutoff of neighbourlist manager and of the representation calculator are mismatched, this does not cause any error but is invalid behavior which can cause at some other point problems (as in the test_calculator with the interpolator, see commit below)

solution for test_caculator commit cb3b3ae2a12d02c60375f2707d6ff3857a76a1ee pull request test_caculator https://github.com/cosmo-epfl/librascal/pull/289