qb spec: bugfix/cleanup power sweep - new method _get_power_param to reduce code replication - allow power sweep via pulse param for SHF - bugfix in output amplitude sweep to implement power sweep for SHF
qb spec: bugfix/cleanup power sweep
- new method _get_power_param to reduce code replication
- allow power sweep via pulse param for SHF
- bugfix in output amplitude sweep to implement power sweep for SHF

QudevETH/PycQED_py3