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55b3c7b81d
Change the autoconf rules so that
- docs are always built and installed unless
`--enable-documentation=no` is passed
- the documentation-build tools latex2man and pdflatex are
autodetected and, if not found, just issue a warning at configure
time and doc builds do nothing. Since built man pages are under
source control this should not have a dire effect.
Fixes #822