[MERGE] Allow -Derror to show exceptions caused by plugin import errors.

[James Westby]

Hi,

Here's my attempt to make -Derror show exceptions from plugin import
problems. I'm not sure it's the right way to go about it though.

For one thing, I don't know if sys.stderr.write will give encoding 
problems? Also, perhaps there's some other code I missed that will call
this, and would lead to the double printing of exception that I tried
to avoid.

Any review would be appreciated.

Thanks,

James

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