see #3499:

 * added DefaultConstructible to mutable matrix and vector container,
 * fixed INTERNAL concept checks

[SVN r56535]

libs/numeric/ublas

@@ -1 +1 @@
-Subproject commit 40995b785b7d9e75c789db6cbf3283efdf170563
+Subproject commit 7a3639c418fbbd255b95a15b749aa8c262626f9a