Reconsider command-line interface (and if we change it, rename "pageutils")

[rrthomas]

See for example #43.

Also think about adding more "gadget" scripts such as my pdfinterleave and pdfcompress.

[jgclark]

The one I'd vote for is pdf-book-for-printing-where-only-long-edge-duplex-is-available. And its equivalent for short-edge.
Though they would clearly need snappier short names!

[rrthomas]

See #65: --quiet currently doesn't do what many users might reasonably expect.