Landscape problems

[Gilles]

Hello.

I had a file with the following:
-----
\version "2.2.0"

#(set-global-staff-size 16)

\include "all.inc.ly"

\score {
    \staves
    \paper {
        orientation = "landscape"
        linewidth=27.0\cm
    }
}
-----

which produced the expected landscape-oriented sheet.

I used "convert-ly-snapshot" (Debian, package from 
http://www.pedrokroeger.net/lilypond/) that converted
it into:
-----
\version "2.4.0"

#(set-global-staff-size 16)

\include "all.inc.ly"

\score {
    \staves
    \layout {
        orientation = "landscape"
        linewidth=27.0\cm
    }
}
-----

Now, the paper is in portrait orientation, (with, of course,
the systems falling off the pages).

Looking into the manual, I saw there isn't an "orientation"
property anymore. [Then, shouldn't "convert-ly" do something
about that?]

I tried 
-----
\version "2.4.0"

#(set-global-staff-size 16)

\include "all.inc.ly"

\score {
    \staves
    \layout {
        hsize=29.7\cm
        vsize=21.0\cm
        linewidth=27.0\cm
    }
}
-----
But it didn't change anything.
[By the way, "\layout" is not referenced in the unified index.
Where is the explanation of this instruction?]

I then moved "hsize" and "vsize" to a global "\paper" section.
To no avail.

The only thing that works is

  #(set-default-paper-size "a4" 'landscape)

at the top of the file.

Well, more or less, because the general layout isn't very pleasing:
there is one system per page (normal because there are 8 staves per
system) but the on the first page, the system is stacked at the bottom
of the page while on the others it is stacked at the top (I'd like it 
to be centered on the page).
I tried several combination of "raggedbottom" and "raggedlastbottom"
(in the "\layout" or in the "\paper" section) but I don't seem to find
the right one.

Isn't all this a bit misleading, or am I missing some important
clue about page layout?

Thanks,
Gilles


P.S. The archive search engine is again not working (as of
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