multiline output variables (fwd)

[Dan Manthey]

This is the final version of my patch to allow multiline output variables.

This patch modifies the CONFIG_FILES section of AC_OUTPUT so that the
generated sed filters correctly handle output variables containing
newlines.  It also has the added benefit that more of the computation
about fragmenting the sed filters is done at configure time instead of
config.status time.  The patch includes documentation changes and changing
the related autotest test to not expect failure.

-Dan

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