OpenSystemsDevelopment / qpdf

Manual edits for cases not handled by search and replace

Using search and replace.

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.

Add new method QPDF::newReserved()

Add new convenience class QPDFObjGen::Guard