Get rid of a couple of copies of the CC0 text. Add header comment to
CC0 files to remind people editing them what the terms are. Also add
some missing XML headers. The header comments in layouts won't bloat
the binary - they get stripped out before compressing, same as any other
comments.
* ngpc.xml: fixed some Japanese titles
* ds1994.cpp: added FIXME comments, removed redundant tag from logging helper, corrected device name, removed copy/pasted application note (copyright infringement)
* midvunit.cpp: marked "recreated" PAL program as a bad dump
