Updated the NEWS file.
Make sure an object doesn't already have a parent when adding it in __init__()
(ie. avoid an infinite loop if __init__() is called twice for an object).
Released as v4.15.5.
Added tag 4.15.5 for changeset 13906834d910
Fixed the handling of enums for C++11.
Fixed the handling of platforms and features that are disabled by other
platforms or features.
Fixed the generation of Qt signal signatures so that they are correct for Qt5.