OpenSystemsDevelopment / qpdf

Ensure copied annotations are fixed (fixes #600)

Case where pages from a main input without /AcroForm key were duplicated
was omitted

Using search and replace.

Add new convenience class QPDFObjGen::Guard

Code tidy re-throwing of exceptions

Warn if catalog type entry is invalid (fixes #810)

Avoid copying exceptions.

Improve --optimize-images to find images nested within XObjects

Also, change QPDFJob to use unique_ptr<QPDF> instead of shared pointers.

Also, inline method and add optional parameter error_msg.

Now --json-output just changes defaults. Allow output file with --json.