[scribus] Clarify printing as spread

[Tom Connolly]

A "printer's spread" is an imposition, in that it will combine pages 1-8, backed by 7-2, etc., in an 8-page booklet, for example.
A "reader's spread" is what Scribus shows during the process of building the booklet, i.e., Page 1-2-3-4 etc.
An "imposition" is manipulating the pages into how the pages will fit on a press. Aside from the imposition done in Adobe Reader to print a booklet, the imposition phase is always done by the commercial printer, because only he knows what press he's going to use and what finishing (cutting, folding, binding, trimming) needs to be done.
Except in the rarest of circumstances, imposition is not done at the creative level, but at the mechanical level. The printer will add his registration marks, cut marks, color bars, fold marks, and will allow for "creep," etc. during imposition. Unless you're intending on buying a million dollar 46-inch printing press, don't worry about imposition. The printer's software, for which he paid a hefty sum, will handle it in a snap of a finger.
I would hate to see the great talent of the people who labor over improving Scribus spend any time on imposition.
Thank you, Scribus developers.
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