multi-macroexpanding backquote != nested backquote

This was quite difficult to diagnose. The issue I noticed was that brline
had stopped working. All the bugs in previous commits were hiding the cause.
Once I cleaned them up, I realized the problem was that the `(,x0 ,y0)
was triggering the nested-backquote check. The fix was fairly straightforward
then (even though I didn't yet understand why). But how to write a test
for this? I spent some time trying to do so without defining a macro using
literal macros, before I realized:

  You can't call literal macros; we don't have first-class macros.

Trying to insert literal macro support just breaks everything because we
have no way to distinguish between a literal macro call and the stage in
macroexpand where a symbol has been replaced with its macro definition.

How do you explain stuff like this? I grow weary of Lisp.

There's still some issue in loading the entire definition of brline from
data.limg.

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