requirements: use pyrf fork of pyqtgraph
fix debian/ubuntu install instructions
CaptureDevice: __init__ backwards compat, device_settings param last
sweep device: fix fstart >= MIN_TUNABLE
matplotlib_plot_sweep: show 0-20G
twisted..sweep: 0-20G
rename twisted_matplotlib_plot_sweep example
pyqtgraph_plot_block.py +x
document pyqtgraph_plot_block example
gui: decimation without import re
separate util.collect_data_and_context for reading without calling capture()
remove commented code
capture device will only send configuration commands only once