* some Japanese (platex) documents fail with inputenc "utf8-platex"
(missing characters in non-Japanese text parts), because the
Unicodechar definitions from "inputenc" are not used.
* some Japanes (platex) documents show wrong output with "auto",
because platex ignores the encoding switch for text parts
in other languages.
* Japanese Beamer documents must set default output to "pdf",
because dvipdfm(x) produces wrong output with document class "Beamer".
* update tagging/inverting rules.
* use HE8 font encoding for Hebrew in language test.
Re-structure and rename files in a transparent way. Most template/example
names now correspond to the (verbose GUI) name of their layouts.
Note that this, most prominently, also changes [LANG/]splash.lyx to
something less insiderish, namely "Welcome.lyx".
