Revert "Fix the Ceylon declaration of Tuple so that it matches the model of the Java implementation of tuple."
Revert "Fix the Ceylon declaration of Tuple so that it matches the model of the Java implementation of tuple."

This reverts commit 85517963b2a9818254433900eca7da66f7f0cff8.

ceylon/ceylon.language,ceylon/ceylon.language,unratito/ceylon.language,unratito/ceylon.language