Add spellchecker scripts for Octave and run spellcheck of documentation interpreter/doccheck: New directory for spelling/grammar scripts. interpreter/doccheck/README: Instructions for using scripts. interpreter/doccheck/spellcheck: Script to spellcheck a Texinfo file. interpreter/doccheck/aspell.conf: GNU Aspell configuration file for Octave documentation. interpreter/doccheck/aspell-octave.en.pws: Private Aspell dictionary. interpreter/doccheck/add_to_aspell_dict: Script to add new Octave-specific words to private Aspell dictionary. interpreter/octave.texi: New @nospell macro which forces Aspell to ignore the word marked by the macro. interpreter/mk_doc_cache.m: Skip new @nospell macro when building doc_cache.

--- a/doc/interpreter/audio.txi
+++ b/doc/interpreter/audio.txi
@@ -32,7 +32,7 @@
 There are many different formats for representing such data.  Currently,
 only the two most popular, @emph{linear encoding} and @emph{mu-law
 encoding}, are supported by Octave.  There is an excellent FAQ on audio
-formats by Guido van Rossum <guido@@cwi.nl> which can be found at any
+formats by Guido van Rossum @email{guido@@cwi.nl} which can be found at any
 FAQ ftp site, in particular in the directory
 @file{/pub/usenet/news.answers/audio-fmts} of the archive site
 @code{rtfm.mit.edu}.