Fix joystick issues [artf3707]

Make axes and POVs 0-based like they are on the DS

Correct default joystick axis numbers to be 0-based

Fix array dimensions for joystick axis values

Increase the number of joystick ports to the maximum 6 that the DS supports

Change-Id: I16d0e6e636188cbdd9cd7bfa0453a62466a55093

wpilibj/wpilibJava/src/main/java/edu/wpi/first/wpilibj/GenericHID.java

@@ -156,6 +156,6 @@ public abstract class GenericHID {
     public abstract int getPOV(int pov);
 
     public int getPOV() {
-        return getPOV(1);
+        return getPOV(0);
     }
 }