Tealdbg Report Errors

## Problem

While debugging some msgpack formatting issues, I was getting an error message that all the programs failed in less than a second.

This information is only partially useful, we have the errors from the call to eval but never print them out to the caller:
https://github.com/algorand/go-algorand/blob/master/cmd/tealdbg/local.go#L560

## Solution

Print the error message