This patch enables AbstractConfiguration to make use of an associated
Interpolator object for performing interpolation not only on String properties
but also on other data types and lists. By setting the Interpolator to null it
is possible to disable interpolation completely.
Backwards compatibility is maintained as much as possible, even in the way
protected methods are called. Only exception is the interpolateHelper() method,
which won't be called any more and was marked as deprecated.
I had to slightly modify the setter method for indexed properties in
ConfigurationDynaBean due to a failing unit test. But after that all tests
Because this patch includes modifications at a core class I would appreciate
comments by others before I commit it. Thanks.