and renamed it "Core words". Also, reworded the presentation.

It was ill-advised.

I hadn't noticed that this word was almost ANS compliant.

Previously, calling quit would break EOT behavior and not properly
quit Collapse OS.

TODO: implement X['] so that I can remove those XCURRENT patterns.

The goal is to insert device drivers in between.

That makes it easier to write drivers that can be xcompiled.

And use them in all places they make sense.

This allows us to get rid of the (parse*) indirection.

This allows us to write LATEST at proper offset in emul/stage1.fs in
cases where we set a nonzero BIN(.

This is done by adding a "C<* override" layer that is reset to 0 on
ABORT.

The problem was that when ABORT happened during a LOAD, we had a
resetted RSP and started from a clean INTERPRET, but LOAD didn't
have the opportunity to restore C<*, which caused it to continue
interpreting from the faulty BLK.

With a C<* override, we don't need to *restore* C<*, we just need to
clear the override.

This is more than cosmetic, it's also highly usable. The presence
or absence of the "ok" message allows us to know whether the command
aborted. Previously, the "> " prompt appeared when the system expected
a prompt in the INTERPRET context, whether the previous command aborted
or not.

Also, this allows us to get rid of that ugly FLAGS global variable.

The way is clear for complete stage1 bootstrapping on the RC2014
target!