isThrowableNested to ExceptionUtils.
It adds static attributes to decide if the stack trace should be topDown
and if the stack traces should be trimmed on repeat. If running 1.4 or higher,
it uses the default stack trace, and the functionality of NestableError,
NestableException and NestableRuntimeException getMessage()s all change.
Accompanying these changes are numerous tests.
Submitted by: Mohan Kishore
git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137314 13f79535-47bb-0310-9956-ffa450edef68