-Wformat is needed by gcc 4.8 (closes #17547)
backout 214d8909513d for regressions (#1159051)
prevent IDLE from trying to close when sys.stdin is reassigned (#17838)
bump version to 2.7.5
update topics
Added tag v2.7.5 for changeset ab05e7dd2788
onto 2.7.6
Issue #17606: Fixed support of encoded byte strings in the XMLGenerator
characters() and ignorableWhitespace() methods.  Original patch by Sebastian
Ortiz Vasquez.