Update insert/erase/append_element to match development version

  Thanks Gunter


[SVN r27640]

libs/numeric/ublas

@@ -1 +1 @@
-Subproject commit 11a743dc361799c73ea972d50cc2636bcb8dd61d
+Subproject commit 000c48cbfad4db5e0eefd31f2e43bfaa17ea1cf5