Eliminate all uses of tab stops in the libX11 man pages.
Two steps: First, expand tabs to 8 spaces in code and structure listings. Second, make the .Ds used to wrap code listings switch to constant-width font (CW) rather than numeric font position 1, which maps to R on most systems. It is possible some archaic systems won't know what CW is, but the only risk is that code listings won't look quite right on troff devices; the PostScript and DVI drivers definitely grok it, so those important cases are OK. The purpose of these changes is to get rid of presentation-level markup so these pages will lift clean to DocBook. Signed-off-by: Eric S. Raymond <firstname.lastname@example.org>
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