Use LyX note instead of comment. This is less invasive that
converting Beamer frames to fragile to accommodate the comment
environment.
(cherry picked from commit e81f6b04bcf878a1170d46b3820e8345436b4db5)
The comment is now in a comment inset. This change is extended to
all versions of beamer.lyx.
Change tracking is not used because it only affects a comment
(consistent with aa81ae7e).
This change is made according to updated conversation at:
https://www.mail-archive.com/search?l=mid&q=nruubc%24uu0%241%40blaine.gmane.org
(cherry picked from commit 40c262cbd865805d35aba65e25e919fc8dee6e69)
Also MacOSX ReadMe files. Note that a few lib/doc files are
also "updated" because trailing spaces are removed, but their file
formats are the same because they were recently updated at 83672113.
I did "git checkout LFUNs.lyx" because this file is generated
automatically and has a special header.
