Fix initial gain setting for uhd_siggen[_gui].py
uhd: added buffer flush when source block is stopped
This is useful for re-running the flowgraph,and avoids the problem of old data on the next run.
examples: making both autotools and cmake install all the same examples.
docs: don't need to distribute README files in docs component. Just the install path.
Merge branch 'next' of gnuradio.org:gnuradio into next
uhd: added some documentation to the UHD main page on standard option parser options and creating a source and setting the parameters.
uhd: added subdevspec option to UHD examples and sets antenna based on option.
uhd: fixing uhd apps to take a subdev spec; also changing to more general uhd parameter of 'args' instead of 'address' which defaults to the first uhd dev found.
docs: installing README files.
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