- Better error messages from instantiation
- "-f" switch
- Help
-- Cropmarks: settable colors
| # Position bbox on a new paper
| paper("a4")
| pen=1pt # Line width
| len=5mm # Cross arm length
| offset=5mm # Distance from border
+| color="RRGGBB"
| book
| signature=<n>
| rotate=1 # Override rotation decision
| scale=1 # Override scaling factor
| hspace / vspace / space # Distance between tiles
-| cmark, cpen, clen, coffset # Cropmark parameters
+| cmark, cpen, clen, coffset, ccolor # Cropmark parameters
# Send pages to multiple pipes and merge their results
mix { ..., ..., ...}