`A` without arguments is now equivalent to `0A`

* It was equivalent to `1A` which is almost never what you want.
  I doubt that any existing macros would be broken by this.
  But neither do I replace all `0A` in the existing code base (yet).
* `A` without arguments is a completely different "append" command in TECO-11,
  but it doesn't make sense in SciTECO and I don't see what else `A` could
  be repurposed for.
  It cannot be made an insertion command since it depends on the stack state
  which we don't track in parse-only mode.
* Added test case.

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