New LiquidCrystal / LiquidCrystal_SR.h

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File LiquidCrystal_SR.h

     @abstract   Sets the pin to control the backlight.
     @discussion Sets the pin in the device to control the backlight.
+    @warning    Currently not supported
     @param      mode: backlight mode (HIGH|LOW)
+    @param      pol: backlight polarity
-   void setBacklightPin ( uint8_t pin );
+   void setBacklightPin ( uint8_t pin, t_backlighPol pol );