fix docbook output
    1. support other than english
    2. fix broken example link id
    3. fix incomplete TOC : no Classe etc.
    4. add brief description for Functions etc.
    5. Comply with REPEAT_BRIEF
    6. Do not output duplicated contents when detailed descripton is missing.
    7. set table colwidth for Param/RetVal
Merge pull request #260 from zmhuang/master

fix docbookgen.cpp to support other than english