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/util/axes.m
+++ b/scripts/plot/util/axes.m
@@ -34,7 +34,7 @@
 ## of children.  This causes @var{hax} to be displayed on top of any other
 ## axes objects (Z-order stacking).
 ##
-## @seealso {gca, set, get}
+## @seealso{gca, set, get}
 ## @end deftypefn
 
 ## Author: jwe
@@ -61,7 +61,7 @@
       hover = hax(idx);
       do_restack = true;
     endif
-    
+
     ## Create an axes object.
     htmp = __go_axes__ (cf, varargin{:});
     if (__is_handle_visible__ (htmp))