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/image/imread.m	Thu Jul 15 12:15:14 2010 +0200
+++ b/scripts/image/imread.m	Sat Jul 17 19:53:01 2010 -0700
@@ -26,10 +26,10 @@
 ##
 ## The size and numeric class of the output depends on the
 ## format of the image.  A color image is returned as an
-## MxNx3 matrix.  Grey-level and black-and-white images are
+## MxNx3 matrix.  Gray-level and black-and-white images are
 ## of size MxN.
 ## The color depth of the image determines the numeric
-## class of the output: "uint8" or "uint16" for grey
+## class of the output: "uint8" or "uint16" for gray
 ## and color, and "logical" for black and white.
 ##
 ## @seealso{imwrite, imfinfo}