Modifies tracing to removed Cause based errors. #63
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This work changes tracing to now offer a new Locationer based error into stack. Printing an Error stack now will provide a line for each error in the stack by calling Unwrap() till no more errors are found.
This fundementally changes the output produced by ErrorStack to now just include each call to Trace() but also contain the value of the error at each Trace() call.
This PR also provides a new documentation worked example.
JUJU-4699