README make target to keep my comments & README in sync
update README
allow data without names; speed up draw() a tad, unnecessarily

and removed some debug code
draw some subtle background blocks to separate the lines a bit
add support for range command & fix errors causing serial comm failure

the serial errors really are due to my bugs;
i didn't want to belive it, but any time an exception
happens, the console just spits out:
"error, disabling serialEvent()".