qe:qb_spec: corrections for hard spectroscopy after tests on Otemma
qe:qb_spec: corrections for hard spectroscopy after tests on Otemma

incl. a first implementation of qb.spec_power controlled tone resp. pulse amplitudes

(cherry picked from commit 3237556fc4ebeaffdc0e27bfd701ab2266e7cb3f)

QudevETH/PycQED_py3