maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.

--- a/scripts/image/hsv2rgb.m	Mon Feb 23 16:42:25 2015 +0000
+++ b/scripts/image/hsv2rgb.m	Mon Feb 23 14:54:39 2015 -0800
@@ -106,7 +106,7 @@
 endfunction
 
 
-%% Test pure colors
+## Test pure colors
 %!assert (hsv2rgb ([0 1 1]), [1 0 0])
 %!assert (hsv2rgb ([1 1 1]), [1 0 0])
 %!assert (hsv2rgb ([1/3 1 1]), [0 1 0])
@@ -120,7 +120,7 @@
 %! hsv_img = rand (64, 64, 3);
 %! assert (rgb2hsv (hsv2rgb (hsv_img)), hsv_img, 1e-6);
 
-%% Test input validation
+## Test input validation
 %!error hsv2rgb ()
 %!error hsv2rgb (1,2)
 %!error <invalid data type> hsv2rgb ({1})