modification de la fonction switch_mux(): lors de l'activation des port, il faut forcer le type des variables pour qu'elles ne soient pas du type array.

I added a function that replace all if statement and control multiplexer based on the two configuration files (path2elec and quadmux.

Instead of reading the interrogation scheme file with another method in order to have its length. I simply used the method shape on N.

* ABMN.txt: interrogation scheme (development and testing purposes)
* path2elec.txt: configuration file: state of the multilexer channels to access each electrode
* quadmux.txt: communication channel of the multiplexer for electrodes A, B, M and N.

suppression de lignes inutiles.