Add commandline-flags from postprocess plugins (fixes #24)
Add commandline-flags from postprocess plugins (fixes #24)

nafraf/spreads,jbaiter/spreads,gareth8118/spreads,miloh/spreads,adongy/spreads,DIYBookScanner/spreads,jbaiter/spreads,adongy/spreads,gareth8118/spreads,jbaiter/spreads,gareth8118/spreads,DIYBookScanner/spreads,adongy/spreads,nafraf/spreads,DIYBookScanner/spreads,miloh/spreads,miloh/spreads,nafraf/spreads