41CL Update stops with * in display

[Monte Dalrymple]

AUTOVFY isn't really necessary, because the serial comm is usually quite reliable. I made it mandatory for the OS sector because I am paranoid about bricking the calculator. Once the feature was available there, I decided to make it available everywhere as an option. The CDBDEL is also not mandatory, but I prefer to delete information like that so that there is no question about stale data the next time the code runs. The FLUPD function automatically deletes the code that it writes to RAM and executes while doing the Flash writes, but doesn't touch the CFLDB in case it aborts early.