Make client more interactive friendly

[jjhursey]

As a developer, often I want to kick off MTT locally with my local build and have it run a mix of tests. If one of those tests fails, I would like an easy way to cd into a directory and run a script that will setup the correct environment for me (if I'm not running an already installed MPI, for example), and another script that will run the failed individual test exactly how it was run by the MTT client.

I can then use this as a starting point to recreate the failure and start debugging.

The current Perl and Python clients are not really setup to do this easily. If you know what you are looking for you can get close. But for a day-to-day developer it would be nice if it was easier.