FilesListPDFUnite parameters

• from_output : [string] (default: '') Collect files from the selected output. When used the source option is ignored.

• source : [string] (default: '*.pdf') File names to add, wildcards allowed. Use ** for recursive match. By default this pattern is applied to the output dir specified with -d command line option.
  See the from_cwd option.

• filter : [string] (default: '.*\\.pdf') A regular expression that source files must match.

• from_cwd : [boolean] (default: false) Use the current working directory instead of the dir specified by -d.