print out commands before they are executed

You can get the commands as they are executed by supplying the verbose=1 option to MB.  However, I find this is actually pretty hard to read from the log.

 - The "+ " prefix *a la* `sh -x` option helps visually distinguish commands from output
 - Turning it on by default makes troubleshooting cpantesters testers (or user reports) easier due to additional information.