rfnoc: More and clearer verbosity
rfnoc: Added window RFNoC block
rfnoc: Adapted to UHD API change for set_channel -> set_rx_channel
rfnoc: Forced number of recvd/sent  samples to be multiples of vector lengths
Merge branch 'rfnoc-devel' of github.com:EttusResearch/gnuradiodev into rfnoc-devel