First working version of calibrate.py
Replaced analysis parameter dbRefWndMs with dbLinRef
rms_analysis.py : Added samples_to_linear_residual()
plot_seq_1.py : initial commit.

Added plot_calibrate.ipynb jupyter notebook.

p_ac.py : changed dutyCyclePct to a list, added real-timen note analysis and multi-pitch tests.
Added keyboard.py, rt_note_analysis.py, plot_note_analysis.py, plot_all_note_durations.ipynb.