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/numbers.txi	Thu Jul 15 12:15:14 2010 +0200
+++ b/doc/interpreter/numbers.txi	Sat Jul 17 19:53:01 2010 -0700
@@ -303,7 +303,7 @@
 @subsection Empty Matrices
 
 A matrix may have one or both dimensions zero, and operations on empty
-matrices are handled as described by Carl de Boor in @cite{An Empty
+matrices are handled as described by Carl @nospell{de} Boor in @cite{An Empty
 Exercise}, SIGNUM, Volume 25, pages 2-6, 1990 and C. N. Nett and W. M.
 Haddad, in @cite{A System-Theoretic Appropriate Realization of the Empty
 Matrix Concept}, IEEE Transactions on Automatic Control, Volume 38,