Adding clearFileBuffer and clearMaxFileBufferAvail

src/SparkFun_u-blox_GNSS_Arduino_Library.h

@@ -557,8 +557,10 @@ public:
 	// Support for data logging
 	void setFileBufferSize(uint16_t bufferSize); // Set the size of the file buffer. This must be called _before_ .begin.
 	uint16_t extractFileBufferData(uint8_t *destination, uint16_t numBytes); // Extract numBytes of data from the file buffer. Copy it to destination. It is the user's responsibility to ensure destination is large enough.
-	uint16_t fileBufferAvailable(void); // Returns the number of bytes available in file buffer which are waiting to be read
-	uint16_t getMaxFileBufferAvail(void); // Returns the maximum number of bytes which the file buffer has contained. Handy for checking the buffer is large enough to handle all the incoming data.
+	uint16_t fileBufferAvailable(void);		// Returns the number of bytes available in file buffer which are waiting to be read
+	uint16_t getMaxFileBufferAvail(void);	// Returns the maximum number of bytes which the file buffer has contained. Handy for checking the buffer is large enough to handle all the incoming data.
+	void clearFileBuffer(void);				// Empty the file buffer - discard all contents
+	void clearMaxFileBufferAvail(void);		// Reset fileBufferMaxAvail
 
 	// Specific commands