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settings menu based on simple_menu to set options instead of overloading buttons several times: -
new option: length of plotted time window -
new option: log pulse instead of (or additionally to) the full ecg graph -
new option: sampling rate
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store the settings to persist to next launch - some cleanup that is desperately needed in this app
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create folder for output files -
rename 'histogram' to 'graph' as it is not a histogram -
approximate timestamp (and cache log filename) to reduce number of time intensive system calls on pulse logging
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