pgbouncer - pgbouncer: doc updates - check if asciidoc & xmlto - accept

Log Message:
-----------
doc updates

- check if asciidoc & xmlto
- accept only asciidoc >= 8.2
- include generated mapages in cvs
- disable generation rules if tools are not available
- add </variablelist> hack to fixman

Modified Files:
--------------
    pgbouncer:
        configure.ac (r1.14 -> r1.15)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/configure.ac.diff?r1=1.14&r2=1.15)
        config.mak.in (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/config.mak.in.diff?r1=1.3&r2=1.4)
        Makefile (r1.9 -> r1.10)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/Makefile.diff?r1=1.9&r2=1.10)
    pgbouncer/doc:
        Makefile (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/doc/Makefile.diff?r1=1.4&r2=1.5)
        fixman.py (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/doc/fixman.py.diff?r1=1.1&r2=1.2)

Added Files:
-----------
    pgbouncer/doc:
        pgbouncer.1 (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/doc/pgbouncer.1?rev=1.1&content-type=text/x-cvsweb-markup)
        pgbouncer.5 (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/doc/pgbouncer.5?rev=1.1&content-type=text/x-cvsweb-markup)