Work around a problem in Suns Forte compiler, which choked on the explicit qualificat...

Work around a problem in Suns Forte compiler, which choked on the explicit qualification of a member template when that member template is an operator, as in
/* --------------------------------------- */
/* Problem 9 -- selecting member templates */
/* by template keyword                   */
/* (Why does it make a difference whether  */
/* member function or operator?)           */
class T7 {
    template <typename T> void operator << (T);
    template <typename T> void f (T);
    void g() {
      this->template f<int> (1);           // OK!
      this->template operator<< <int> (1); // not!
    };
};

Work around by introducing a common function for the template and the nontemplate function.

git-svn-id: https://svn.dealii.org/trunk@5598 0785d39b-7218-0410-832d-ea1e28bc413d