2019-02-28: wsfulton
            [Java] std::vector improvements for types that do not have a default constructor.

            The std::vector wrappers have been changed to work by default for elements that are
            not default insertable, i.e. have no default constructor. This has been achieved by
            not wrapping:

              vector(size_type n);

            Previously the above had to be ignored via %ignore.

            If the above constructor is still required it can be added back in again via %extend:

              %extend std::vector {
                vector(size_type count) { return new std::vector< T >(count); }
              }

            Alternatively, the following wrapped constructor could be used as it provides near-enough
            equivalent functionality:

              vector(jint count, const value_type& value);

            *** POTENTIAL INCOMPATIBILITY ***