bug#13880: Change encodings of tutorials, thai-word to UTF-8

[Paul Eggert]

Tags: patch

Attached is a proposed patch to change encodings of
Emacs source files to UTF-8 when it's easy, i.e., no
change should be needed to the Emacs build or maintenance
procedure because of this.  The affected files are tutorials,
one reference card, and thai-word.el.

The patch is a bit tricky to view, since it contains a mishmash of
encodings, but the result should be straightforward.

I've already made some minor changes in this area, but the
attached changes are fairly large so I thought them worth
posting for a review.  I'm also CC'ing this to Mr. Handa
who is our leading encoding expert.

encoding.txt
Description: Text document