By default, it changes nothing, but it allows interesting
setups, such as using AT28! for directly uploading to EEPROM.

I've also updated the EEPROM recipe to upload directly to 0x2000.
I'm not sure what has changed, but it's working fine now.

So far, I hadn't managed to run those tools properly on OpenBSD. I
was too confused by its stty peculiarities. I'm still confused, but
at least I managed to make them work... most of the time...

Addressed devices are not included in Collapse OS by default. Let's
just accept that upload only works with memory.

not actually tested yet...

It makes the tool much more versatile. I'll have adev being included
in all recipes, so it can be assumed.

Also, increase STDIO_BUFSIZE to 0x40 so that those while loops work.

By uploading a BASIC loop and then run it, we can reduce the serial
communication to pure content which greatly reduces the overhead and make
the process much much faster.