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/sparse/treelayout.m	Mon Feb 23 16:42:25 2015 +0000
+++ b/scripts/sparse/treelayout.m	Mon Feb 23 14:54:39 2015 -0800
@@ -32,7 +32,7 @@
   if (nargin < 1 || nargin > 2 || nargout > 4)
     print_usage ();
   elseif (! isvector (tree) || rows (tree) != 1 || ! isnumeric (tree)
-          ||  any (tree > length (tree)) || any (tree < 0))
+          || any (tree > length (tree)) || any (tree < 0))
     error ("treelayout: the first input argument must be a vector of predecessors");
   else
     ## Make it a row vector.