[Distutils] Improved error handling in zc.buildout

[Jim Fulton]

A major annoyance in zc.buildout has been its poor error handling.   
Generally, when an error occurred, a a traceback would be printed  
giving little or no clue about what went wrong or what was going on.   
Previously, I was focussed on important features.  The latest release  
focusses on better error reporting and debugging support.  I'd like  
to continue to provide some emphasis on this, so feedback would be  
especially appreciated now that I think I've improved error handling  
quite a bit.

Jim

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