(builting and in itertools module, i.e. map(), itertools.chain(), etc).

#17572: Avoid chained exceptions while passing bad directives to time.strptime().  Initial patch by Claudiu Popa.

Patch by Thomas Heller.

Add an unit test to ensure that text files are rejectect (with TypeError)

This was already done in Python3, but having it wrong leads to
incorrect debug output, so it seems worth fixing in 2.7 as well.

Patch by Victor Terrón.

This means we can remove our usage of qsort() than relied on undefined behavior.

-v/-vv that were lost in the transition to importlib.