* lang/qt/src/signkeyjob.h (SignKeyJob::setExpirationDate): New.
* lang/qt/src/qgpgmesignkeyjob.h, lang/qt/src/qgpgmesignkeyjob.cpp
(QGpgMESignKeyJob::setExpirationDate): New.
* lang/qt/src/qgpgmesignkeyjob.cpp (QGpgMESignKeyJob::Private): Add
member m_expiration.
(sign_key): Handle expiration date.
(QGpgMESignKeyJob::start): Pass expiration date to sign_key.
* lang/qt/tests/t-various.cpp
(TestVarious::testSignKeyWithoutExpiration,
TestVarious::testSignKeyWithExpiration): New.
(TestVarious::initTestCase): Add "allow-weak-key-signatures" to
gpg.conf.