PDFUniteOptions parameters
output : [string] (default:
'%f-%i%I%v.%x') Name for the generated PDF (%i=name of the output %x=pdf). Affected by global options.outputs : [FilesListPDFUnite parameters] [list(dict)] (default:
[]) Which files will be included.use_external_command: [boolean] (default:false) Use the pdfunite tool instead of PyPDF2 Python module.