Add start of RFCOMM service layer to the incomplete BluetoothHost demo.

Reduce the size of the attribute search list from 15 ranges to 8 to save RAM.

Demos/Host/Incomplete/BluetoothHost/Lib/ServiceDiscoveryProtocol.h

@@ -60,6 +60,12 @@
 		#define SDP_PDU_SERVICESEARCHATTRIBUTEREQUEST   0x06
 		#define SDP_PDU_SERVICESEARCHATTRIBUTERESPONSE  0x07
 		
+		/** Convenience macro - read a pointer out of PROGMEM space.
+		 *
+		 *  \param[in] x  Address of the pointer to read
+		 *
+		 *  \return  Pointer retrieved from PROGMEM space
+		 */
 		#define pgm_read_ptr(x)                         (void*)pgm_read_word(x)
 
 	/* Enums: */