Does anybody remember the reason why we strictly disallow nesting of 
bibliographies (the only style we do this btw)?

static bool changeDepthAllowed(Text::DEPTH_CHANGE type,
                        Paragraph const & par, int max_depth)
{
        if (par.layout().labeltype == LABEL_BIBLIO)
                return false;
...
}

In beamer, bibliographies will need to be nested (inside frame), and I also 
can imagine diverse other cases where nesting would be perfectly legitimate.

I tend to remove this restriction altogether, but if someone comes up with a 
convincing reason why we should keep it for some reasons/classes, I will go 
for another solution (such as a "nestable" layout tag).

Jürgen

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