- Integrate pdf-tools.cc with the rest of the code
- What if an input page specifies /Rotate?
- Better error messages from instantiation
- page->index: use or remove
- rename page->bbox to page->image_box?

# Position bbox on a new paper
paper("a4")
paper(w=210mm,h=297mm,pos=(t|b|c)(l|r|c))

# Scale paper to a new size
scaleto("a4")
scaleto(w=210mm,h=297mm,pos=tl)

# Fit image to a paper
# If paper is given: scale image
# If no paper is given: adjust paper to image + margins
fit("a4")
fit(w=, h=)
margin= hmargin= vmargin=
lmargin= rmargin= tmargin= bmargin=
pos=

# Adjust paper size
expand(10mm)
expand(h=10mm, v=20mm)
expand(l=10mm, r=10mm, t=10mm, b=10mm)

# Adjust image size (in terms of margins around)
margins ... params like expand

cropmarks
	style=box	# Box around image
	style=cross	# Crosses in the corners
	style=halfcross	# Half-crosses in the corners (default)
	pen=1pt		# Line width
	len=5mm		# Cross arm length
	dist=5mm	# Distance from border

book
	signature=<n>

# Crop to image box
crop
	bleed=5mm	# Allow bleeding over the image box

duplex
	long-edge

merge

modulo
	half

# Add an empty page after the current one
add-blank

# Set either:
#	- paper size + margins
#	- scale + margins
nup(hnum, vnum)
	paper / w / h	# Specify paper size, default=copy from 1st image
	+ fit options (*margin, pos)
	crop		# Crop to image
	rotate=1	# Override rotation decision
	scale=1		# Override scaling factor
	tile		# Tile with copies of a single page
	hspace / vspace / space	# Distance between tiles
	+ cropmarks?