5404 - subx/examples/ex1 now translating

The result isn't an identical binary to before, and it segfaults when
run. But it's bugfix seven.

A couple of places where we make .subx files a little more strict:

a) All .subx files must define a data segment. Even if they have no
data.

b) All .subx files must define an `Entry` label for the binary to start
at. Earlier we used to default to the start of the code label. That's
not too hard to add; we'd just need to:
  i) rename `get` to `get-or-abort`
  ii) clone a third variant of `get-or-insert` called `get` that returns
     null if the key is not found.
  iii) use `get` rather than `get-or-abort` when looking up the `Entry`
     label.

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