bug#22429: Force character to be recognized as LTR inside RTL paragraph

[Eli Zaretskii]

> Date: Fri, 22 Jan 2016 10:08:06 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 22429@debbugs.gnu.org
> 
> The correct solution to these problems is to wrap the footnote block
> in the LRE..PDF or LRI..PDI control characters, so that the footnote
> is rendered independently of the surrounding bidirectional context.

Actually, LRM should also work, you just need to put it on both sides
of the footnote, like below:

\begin{hebrew}
  \pstart

בְּרֵאשִׁ֖ית‎\footnoteA{This is a Hebrew related footnote}‎ בָּרָ֣א אֱלֹהִ֑ים 
אֵ֥ת הַשָּׁמַ֖יִם וְאֵ֥ת הָאָֽרֶץ׃

  \pend
\end{hebrew}