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**Added:**
* Add ability to perform multiple morphs in one call using --multiple.
* A FILE is morphed against every file in a given DIRECTORY.
* Can sort PDFs by some field parameter in the header using --sort-by.
* Can also find the field from some serialized metadata file using --serial-file.
* pdfmorph python function call, which reproduce the application
**Changed:**
* Can now use --verbose tag to limit amount of header information