Added beacon feature, updated display code and made analog speed feature optional

Added a short manual/howto

Added the beacon routine, it is turned on by the #define method. Could be more elegant but works for now.

Made the analog speed control optional and put in an easy place to set the speed manually in the code if the speed control is not desired.

Left Keyer enabled by default since it will detect a straight key.

Updated a couple of 4 bit LCD things.