- slides.layout, seminar.layout: Both classes don't create presentations, but transpa...

- slides.layout, seminar.layout: Both classes don't create presentations, but transparencies as clearly stated at CTAN and the package description. (There's a big difference between a transparency (used for overhead projectors) and a presentation (used for beamers).)

- seminar.layout: updated layout file from Günter Milde to fix a few long standing issues with the visualization within LyX

- seminar.lyx: new example file, also from Günter Milde

The updated layout and new example file can also go to LyX 1.5, Jürgen?

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@26929 a592a061-630c-0410-9148-cb99ea01b6c8