Changed reward (and some speakers) from port 7 to port 4

[jgmaz]

I moved the solenoid for the reward from port 7 to port 4, alongside with the associated speakers (speakers: 0, 1,2, powerlines: 0,1). See below for updated pins.

In hardware definition file:
lickometer = Lickometer(lick_port=board.port_6, sol_port=board.port_4, rising_event_A='lick', debounce=5)

In AudioStim device:
pins = {0:'W10', # Dir0 1:'W68', # Dir1 2:'W66', # Dir2 3:'W58', # Dir3 4:'W56', # Dir4 5:'W64', # Dir5 6:'W62'} # Dir6

    '#the POW pins used so that their logic level is inverted automatically.
    powerlines = ('W23', 'W25', 'W62', 'W64','W30','W32')`