OpenSystemsDevelopment / qpdf

Remove variables obsoleted by commit 4f24617.

Avoid running generate_auto_job -- rather than using maintainer mode,
just enable WERROR.

* native UTF-8 strings
* names whose PDF and canonical syntax differ in both dictionary key
  positions and other positions

For json, names are converted both as names and directly when used as
dictionary keys.

* Replace --create-from-json=file with --json-input, which causes the
  regular input to be treated as json.
* Eliminate --to-json
* In --json=2, bring back "objects" and eliminate "objectinfo". Stream
  data is never present.
* In --json-output=2, write "qpdf-v2" with "objects" and include
  stream data.

There are no automated tests yet, but committing work so far in
preparation for some refactoring.

These mean to leave the original values alone. This is needed for
reconstructing streams from JSON given that the stream data and stream
dictionary may appear in any order in the JSON.

I decided these were confusing and inconsistent with how JSON works.
They muddle the API rather than improving it.

Also add stubs for top-level QPDF methods (createFromJSON,
updateFromJSON)