Fix duplicate documentation (#1001301) by using only %doc magic
    
    - Add BR graphviz (for images in doxygen docs)
    - Use sed to disable HTML_TIMESTAMP setting in Doxyfile.in
    - Fix URL tags (pages have moved)
    - Add ChangeLog to %doc
    - Remove empty %doc lines
    - Remove obsolete BuildRoot definition/cleaning
    - Fix -devel package Group tag to "Development/Libraries"
    - Add %?_isa to -devel base package dep
    - Remove %defattr