[PATCH] Minor improvements to citation/bibliography/index output

Hi,

Please find a patch against the current head of SVN (r845) attached
which slightly improves the output of citations, the bibliography
and the ToC entry of the index. In detail, these are:

  - A citation in now separated by a non-breakable space from the
    preceding text. This is implemented for HTML, LaTeX, man, RTF
    and XML output (to the best of my knowledge; only HTML and
    LaTeX tested).

  - For LaTeX, the entries in the table of contents for the index
    and bibliography should use the "top-level" sectional unit used
    for the document itself. That is, 'section' if COMPACT_LATEX=yes
    and 'chapter' otherwise.
    (The current default, 'part', is set in a larger font which looks
    quite ugly.)

  - For LaTeX, the references section is called 'Bibliography' when
    OUTPUT_LANGUAGE=English. However, the ToC entry uses the string
    from the translator class, which was 'Bibliographic References'.
    For consistency, I changed it to 'Bibliography'.

Hope this makes sense.

Thanks,
Markus

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