removed axis and set correct initial zoom
refactor slider with more parameters
change window title
refactored launch_gui with better variable names and passed number of curves in parameters
refactored update with better variable names
added an optional argument to launch_gui to test the display of a pure tone
added a function to generate pure tones
corrected a bug in function to generate pure tones
launch_gui: the freq_test argument was not used
added command line arguments parsing, and a new option to test the gui with a pure tone of given frequency
added a new option to set the number of blobs
added a new option to set the window size + refactoring
new module to deal with the pyaudio part
Removed commend line option to set the window size

Replaced by a slider in the gui. The user can adjust the slider to
select the size of the data on which the DFT is computed.
A smaller window gives a smaller resolution in frequency.