doctest quiet again before exit how

[p.lavarre at ieee.org]

> ... every run of doctest after the first is verbose ...
> *** DocTestRunner.merge: '__main__' in both testers; summing outcomes.

Another path to the same bug:

import doctest
print doctest.testfile(__file__, verbose=False)
print doctest.testfile(__file__, verbose=False)

Mystifiedly yours, rank Python newbie, Pat LaVarre