build: doc: "make" builds & installs a full set of man pages

This enables one to enter "man <any nfq function>" and get the appropriate
group man page created by doxygen.

 - New makefile in doxygen directory. Rebuilds documentation if any sources
   change that contain doxygen comments, or if fixmanpages.sh changes
 - New shell script fixmanpages.sh which
   - Renames each group man page to the first function listed therein
   - Creates symlinks for subsequently listed functions (if any)
   - Deletes _* temp files
 - Update top-level makefile to visit new subdir doxygen
 - Update top-level configure to only build documentation if doxygen installed

Signed-off-by: Duncan Roe <duncan_roe@optusnet.com.au>
Signed-off-by: Florian Westphal <fw@strlen.de>

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