Update FLTK.  Avoid mentioning fltk 2.0 since it probably doesn't work.
Try using <verb> around code blocks; with sgml2latex, <code> places
ugly horizontal rules around the blocks and misplaces them so that they
crop some of the text.

Describe "detach" command and new cross-eyed stereo feature.
Describe thresh, only=/only-/only+, see and sel commands.
But really need a separate section about how selection sets should work.
(Maybe writing the section will make it clear how they *should* work.)
Add "thresh" example.  Look at stellar distribution by B-V -- the Orion
spur really does show up in blue!

Describe transform syntax including "tfm camera", making multiplication
order explicit.

Describe colormap file syntax in new section.  Document "cment" & "vcmap" cmds.