[ublas] Add initializing constructor to vector.hpp

From: Neal Becker (ndbecker2_at_[hidden])
Date: 2005-08-18 08:31:04

This is a good addition to vector.hpp, please add it:
         BOOST_UBLAS_INLINE
+        vector (size_type size, const value_type &init):
+            vector_container<self_type> (),
+            data_ (size, init, typename array_type::allocator_type()) {}