PyHEADTAIL v1.4.1

Hotfix: detuners did not use relative phase advances accQ_x, accQ_y.

This hotfix makes the detuners use the relative bare betatron
phase advance per segment instead of the averaged segment_length.

This is important if accQ_x and accQ_y in the TransverseMap
during setup are not given as scalar values of the betatron tune
(which ends in the smooth approximation) but instead are taken as
varying arrays e.g. from real TWISS lattices.

RFQ, Detuners and TransverseTrackings have been adapted in both
Python and Cython versions. Also the tests have been adapted
both in interactive-tests and unittests.