OpenSystemsDevelopment / qpdf

Positional arguments are supported in a backward-compatible way, but
completion no longer guides users to it.

Add the command-line arguments. They don't do anything yet.

JSON accepts scientific notation, but PDF doesn't.

To reference another command line option description, `:qpdf:ref:` is needed instead of `:qpdf:option:` which is not resolved properly in the HTML documentation.

Future

Also enforce in format-code.

If /AP is a dictionary of streams rather than a dictionary of
dictionaries, disregard /AS, which is supposed to point to a subkey of
one of the dictionaries. This fix prevents qpdf's annotation
flattening from discarding some annotations when /AS is erroneously
set.