The Devel::StackTrace module contains two classes, Devel::StackTrace and
Devel::StackTraceFrame. The goal of this object is to encapsulate the
information that can found through using the caller() function, as well
as providing a simple interface to this data.

The Devel::StackTrace object contains a set of Devel::StackTraceFrame
objects, one for each level of the stack. The frames contain all the
data available from "caller()".

This code was created to support my Exception::Class::Base class (part
of Exception::Class) but may be useful in other contexts.

Authors: Dave Rolsky,