====== portOut ======

''void portOut (u16 portNumber, u8 value)''
|portNumber : Port Number of an individual port (not a port block) | 
|value : 0 or 1 (0=Off, 1=On)  |

Sets portNumber's output state on (value=1) or off (value= 0). The port block containing the given port,
portNumber, must have its I/O mode set to Output beforehand. 

<code c>
portOut(20,1);     // Turns port 20 on
portOut(20,0);     // Turns port 20 off
</code>

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