Revert "more string tests" because equals() is refined on String so that it doesn't respect the semantics of List.equals().
Revert "more string tests" because equals() is refined on String so that it
doesn't respect the semantics of List.equals().

This reverts commit 764b7970ec6fccc49f33eb0ec193d56042e49b8a.

jvasileff/ceylon.language,lucaswerkmeister/ceylon.language,unratito/ceylon.language,unratito/ceylon.language,ceylon/ceylon.language,ceylon/ceylon.language,jvasileff/ceylon.language,lucaswerkmeister/ceylon.language