[issue1498] Rename __builtins__ to __root_namespace__?

[Raymond Hettinger]

Raymond Hettinger added the comment:

FWIW, I find __root__ to be just right.  It is not subject 
misspelling.  It is distinct enough to serve as a mental link to a 
specific concept.  The leading and trailing underscores cause just 
enough typing pain that I wouldn't want anything longer.

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nosy: +rhettinger

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