It wasn't used much, so I replaced its use in the kernel with direct code
and moved the routine in apps/ed, the only other place where it was used.

The order in which cfspack includes its file depend on the platform. To have
tests that reliably pass, test.cfs has to be committed in.

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

Also, always end the CFS chain with a stop block.

fixes #55 #56 #57

ref #80

ref #80

fixes #80

Also made Makefile actually portable.

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.

A little life saver if your target shell doesn't have a proper at28w.

It's no longer required to use `gmake` under OpenBSD and shell scripts
no longer require bash.

In C this time. Python/Perl code is barely terser than C for these little
tools. Why bother with interpreted?

I know, this is silly, but I'm moving tools to something a bit closer to the
system. I consider perl to be more system-like than python for a simple reason:
perl is part of the OpenBSD base system and python is not.

Also, I'm learning perl and using this as an opportunity.

I forgot to update this when changing stdio GetC API.

putc didn't work well with any byte value on most terminal configuration. It
was a bad idea...

This gives the maximum size of the stack at any given moment during the
execution of the program. It's useful to figure out if the stack gets
dangerously close to the heap.

markdown formatting was broken. Also, don't mark it as WIP.

This shaves off quite a few bytes from the binary.

This is becoming the new shell, it has to step up to its new responsibilities!

With a 0x4000 RAMSTART, bshell's RAM usage clashed with USER_CODE, making
RAM-using userapp break everything.

Shell replacement sequence beginning in 3, 2, 1...

Mechanism for assigning inputs to the specified variable is clumsy and uses
binary space. Always using A is much simpler and doesn't seem very limiting to
me. I do that because there's many more "input" commands I'd like to add.

Also, add the new `bshell` emulated tool. BASIC is on its way to replace the
shell.