[Bug-apl] Value constructors made protected

[Juergen Sauermann]

Hi, in order to prevent the incorrect usage of constructors of class Value, I have made them all "protected:". This means that in your own code you should replace, e.g.: Value_P Z(new Value(...)); by: Value_P Z(...); I.e. remove the words "new Value" and optionally the () that are now redundant. I have adapted the libraries that ship with GNU APL (sql not tested) so please update your repositories. SVN 537. /// Jürgen