Most of the changes to Abstract and DataArray were to fix up
ambiguous references to 'id' and 'number' and clarify whether they
refer to tuples or values.

Many docstrings were removed for overridden virtuals. Doxygen will use
the base class's docstring for the virtual, which prevents inconsistencies
where one instance of the docstring changes but the others are left
untouched.

Also removed vtkSOADataArrayTemplate::Resizable. This can be reimplemented
later in a more general way if needed.