Documentation build changes (try 3)

[Vincent Béron]

Incorporated Dustin's requests for more detailed build targets.
Replaces the previous patch "Documentation build changes",
docu-build.diff.

configure must be rebuilt after (I only have autoconf 2.53, and the CVS
configure has been made by autoconf 2.54).

Changelog:
Allows the building of separate guides rather than only the big one.
Determines the name of the installed docbook filter (db2html or
docbook2html, etc.) in configure, defaulting to false if absent.

Vincent
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