Deprecated SCALAR_ET removed

Simplief to use references directly. conversion from scalar_reference causes massive problems with intervals


[SVN r27670]

libs/numeric/ublas

@@ -1 +1 @@
-Subproject commit 17c06c3460589d1a45a840f0084b01633794f9ae
+Subproject commit c7f693b7bf1af2e224dcefc5fbc58b1871a69a3e