volk: make both test cases look and function the same.
volk: added README file to explain how to run the benchmark tests and plotting tool.
volk: complex_to_arg doesn't actually use Volk. No need to benchmark it.
volk: can specify a table to calculate the percent improvement against instead of just the raw numbers.
volk: better handling of plot for error bars. Older versions of pylab don't like the kwargs.
volk: better args for benchmarking volk tests; can specify a list of test numbers.
volk: improved GR benchmark and plotting utilities.
volk: test commands for measuring type conversion performance.
volk: adding an examples directory with scripts to benchmark and compare volk-optimized GR blocks.
uhd: change examples to use new stream api
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