update to be compliant with latest qcodes versions
update to be compliant with latest qcodes versions

fix fixes errors in the tests of test_kernel_distortions.py and
test_lfilt_kernel_object.py

DiCarloLab-Delft/PycQED_py3,DiCarloLab-Delft/PycQED_py3,DiCarloLab-Delft/PycQED_py3