Fixed a bug in the gpio readall command on model B's (caused by a side-effect

of changing it for the B+)

Aded a gpio command: usbp hi/low - to change the usb power

gpio/gpio.1

@@ -13,11 +13,11 @@ gpio \- Command-line access to Raspberry Pi's GPIO
 .PP
 .B gpio
 .B [ \-x extension:params ]
-.B mode/read/write/aread/awrite/pwm ...
+.B mode/read/write/aread/awrite/pwm/pwmTone ...
 .PP
 .B gpio
 .B [ \-p ]
-.B read/write/wb
+.B read/write/toggle/wb
 .B ...
 .PP
 .B gpio
@@ -39,6 +39,10 @@ gpio \- Command-line access to Raspberry Pi's GPIO
 group value
 .PP
 .B gpio
+.B usbp
+high | low
+.PP
+.B gpio
 .B pwm-bal/pwm-ms
 .PP
 .B gpio
@@ -231,6 +235,13 @@ Change the pad driver value for the given pad group to the supplied drive
 value. Group is 0, 1 or 2 and value is 0-7. Do not use unless you are
 absolutely sure you know what you're doing.
 
+.TP
+.B usbp
+high | low
+
+Change the USB current limiter to high (1.2 amps) or low (the default, 600mA)
+This is only applicable to the model B+
+
 .TP
 .B pwm-bal/pwm-ms 
 Change the PWM mode to balanced (the default) or mark:space ratio (traditional)