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/scripts/signal/diffpara.m	Thu Jul 15 12:15:14 2010 +0200
+++ b/scripts/signal/diffpara.m	Sat Jul 17 19:53:01 2010 -0700
@@ -33,8 +33,8 @@
 ## described above is returned in @var{dd}.  The value of @var{d} is
 ## simply the mean of @var{dd}.
 ##
-## Reference: Brockwell, Peter J. & Davis, Richard A. Time Series:
-## Theory and Methods Springer 1987.
+## Reference: P.J. Brockwell & R.A. Davis. @cite{Time Series:
+## Theory and Methods}. Springer 1987.
 ## @end deftypefn
 
 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>