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/plot/draw/private/__patch__.m	Mon Feb 23 16:42:25 2015 +0000
+++ b/scripts/plot/draw/private/__patch__.m	Mon Feb 23 14:54:39 2015 -0800
@@ -168,7 +168,7 @@
       elseif (ischar (c) && rem (nargin - iarg, 2) == 0)
         ## Assume any additional argument over an even number is a color string.
         args{7} = "facecolor";
-        args{8} =  tolower (c);
+        args{8} = tolower (c);
         args{9} = "cdata";
         args{10} = [];
       else
@@ -184,7 +184,7 @@
     args = varargin;
   endif
 
-  if (!failed)
+  if (! failed)
     h = __go_patch__ (p, args{:});
   endif
 endfunction