OpenSystemsDevelopment / qpdf

When there is no context for writing output or error messages, use the
default logger.

This includes the output PDF, streams from --show-object and
attachments from --save-attachment. This also enables --verbose and
--progress to work with saving to stdout.

Remove variables obsoleted by commit 4f24617.

* 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.

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

The last offset is irrelevant to not being able to find /Root.

This makes it a lot easier to run parts of the test suite.

There is one unexpected pass in this commit. This script was applied
to the files changed in this commit:

----------
#!/usr/bin/env python3
import json
import sys

def json_dumps(data):
    return json.dumps(data, ensure_ascii=False,
                      indent=2, separators=(',', ': '))

for filename in sys.argv[1:]:
    with open(filename, 'r') as f:
        data = json.loads(f.read())
    data['version'] = 2
    objectinfo = {}
    if 'objectinfo' in data:
        objectinfo = data['objectinfo']
        del data['objectinfo']
    if 'objects' not in data:
        continue
    qpdf = {'jsonversion': 2, 'pdfversion': '1.3', 'objects': {}}
    for k, v in data['objects'].items():
        is_stream = objectinfo.get(k, {}).get('stream', {}).get('is', False)
        if k.endswith(' R'):
            k = 'obj:' + k
        if is_stream:
            v = {'stream': {'dict': v}}
        else:
            v = {'value': v}
        qpdf['objects'][k] = v
    data['qpdf'] = qpdf
    del data['objects']
print(json_dumps(data))
----------

moddify -> modify. Also carefully spell checked all remaining keys by
splitting them into words and running a spell checker, not just
relying on visual proofreading. That was the only one.

Not fully exercised in this commit

Also refine the herustic for deciding whether to use hexadecimal
notation for a string.

Update getJSON() methods and calls to them