Fix matfaust.Faust.mtimes_trans and tests MATLAB_FAUST_CONFIG*, MATLAB_FAUST_SPEED.

The function mtimes_trans is not really useful and is kept just for old tests.

wrapper/matlab/+matfaust/@Faust/Faust.m

@@ -791,10 +791,10 @@ classdef Faust < handle % subclass of handle for Faust.delete to be called on cl
 		%======================================================================
 		function C = mtimes_trans(F, A, trans)
 			%%
-            if trans
-                F = F.'
-            end
-            mtimes(F, A)
+			if trans
+				F = F.'
+			end
+			C = mtimes(F, A)
 		end
 
 		%======================================================================