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/statistics/tests/manova.m
+++ b/scripts/statistics/tests/manova.m
@@ -53,7 +53,7 @@
 
   [n, p] = size (x);
 
-  if (!isvector (g) || (length (g) != n))
+  if (! isvector (g) || (length (g) != n))
     error ("manova: G must be a vector of length rows (X)");
   endif
 
@@ -85,9 +85,9 @@
   l = real (eig (SSB / SSW));
 
   if (isa (l, "single"))
-    l (l < eps ("single")) = 0;
+    l(l < eps ("single")) = 0;
   else
-    l (l < eps) = 0;
+    l(l < eps) = 0;
   endif
 
   ## Wilks' Lambda