OpenSystemsDevelopment / qpdf

...when flattening annotations. This includes /Link, /Popup,
and /Projection.

Rather than adding yet another flag that is almost never useful on its
own, just have --remove-restrictions disable digital signatures. The
operations are still separate in the API.

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

JSON accepts scientific notation, but PDF doesn't.

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.

Lazily load MD5 and RC4 once in the life of the program. Only load the
legacy provider if RC4 is actually being used.