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/linear-algebra/onenormest.m
+++ b/scripts/linear-algebra/onenormest.m
@@ -39,13 +39,13 @@
 ##
 ## References: 
 ## @itemize
-## @item Nicholas J. Higham and Françoise Tisseur, "A Block Algorithm
+## @item N.J. Higham and F. Tisseur, @cite{A Block Algorithm
 ## for Matrix 1-Norm Estimation, with an Application to 1-Norm
-## Pseudospectra." SIMAX vol 21, no 4, pp 1185-1201.
+## Pseudospectra}. SIMAX vol 21, no 4, pp 1185-1201.
 ## @url{http://dx.doi.org/10.1137/S0895479899356080}
-## @item Nicholas J. Higham and Françoise Tisseur, "A Block Algorithm
+## @item N.J. Higham and F. Tisseur, @cite{A Block Algorithm
 ## for Matrix 1-Norm Estimation, with an Application to 1-Norm
-## Pseudospectra." @url{http://citeseer.ist.psu.edu/223007.html}
+## Pseudospectra}. @url{http://citeseer.ist.psu.edu/223007.html}
 ## @end itemize
 ##
 ## @seealso{condest, norm, cond}