This shuts up a lot of GCC warnings...

* cineca/refactoring:
  Moved simple examples from tests to examples
  Removed explicit template instantiation of vector operations
  Removed explicit template instantiation of small templates
  Reordered methods of Array to group similar methods together
  Renamed ElementType to ValueType and Element to Value
  Removed Array::touch method

This is closer to value_type which is used in STL containers.

It has not been implemented in the past decade so it can be safely
assumed that it is useless.