(1) add flash memory access
(2) add more cmd help info when main() starts
the format of serial data string are updated to support new file format,
see the TN_SoftwareStructure by XD
update swingLED() in main.cpp a bit by inserting a delay
between printf("DATAIRUVBEGIN...") and the first line of data
printf.
insert delay between two pc.printf() statements to allow Beagle have time to process its rxbuf
Insert a delay of 0.2 sec (delayAfterMoveMotor) after moving motor and before starting A/D conversion in swingLED()

Signed-off-by: Dan <xuewu.dai@eng.ox.ac.uk>