Added trellis_constellation_metrics_cf. It is equivalent to trellis_metrics_c but it uses the constellation object's calc_metric method. This method is also added here. trellis_metric_type.h is moved to gr_metric_type since constellation object is now dependent on it.
Forgot to add qpsk.py in last commit.
Added QPSK constellation object.
Added BPSK constellation object.
Added ofdm_frame_sink2. Like ofdm_frame_sink but uses constellation object.
Modified python level OFDM to use constellation object.
Fixed Makefiles to generate swig_doc.i
Merged upstream from next
Minor typo in comments.
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