TDPL goes out for preliminary review

[Don]

Jason House wrote:
> Maybe the biggest help for those converting to shared would be inclusion of 
> why a particular variable is shared and causing the error.  Shared can be 
> viral, and exactly how a piece of code is getting called in shared context 
> can occasionally be a bit unclear.  I think there was a related patch for 
> inclusion of stack traces with templated code?
The stack trace patch is in.