latex treedoc: convert images to thumbnails for embedding #1620
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Images are included by the latex code in full into the rendering, instead of only the rectangle selected in gramps' media DB. Having lots of big photos with small faces in my setup, this leads to unreasonably huge PDF files with unrecognizably small faces in them.
Also, some characters (e.g. comma, spaces) in filepaths might trouble the latex parser, see 75921ce and 2da93aa -- using thumbnails this is circumvented.
However, note this makes the resulting .tex file not standalone anymore.