Modified python level OFDM to use constellation object.
Merged upstream from next
Added support for PSK to generic modulation.
Tidied QAM modulation.
Changed pky.py so that is possible to skip modulation/demodulation steps.
Worked on generic demodulation.
Merge branch 'master' into next
Under extreme circumstances, optfir might never produce an answer (atten>300), so this puts in a check on the ripple; if it gets too large, stop trying.
Allowing PFB interpolator to be called without specifying the taps; autogen taps inside hierblock.
Allowing PFB decimator to be called without specifying the taps; autogen taps inside hierblock.
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