Qt: Add keyLocateJob and test for it
* configure.ac (LIBQGPGME_LT_REVISION): Bump. * lang/qt/src/protocol.h (locateKeysJob): Add Job. * lang/qt/src/protocol_p.h (locateKeysJob): Implement. * lang/qt/tests/Makefile.am: Add t-keylocate. * lang/qt/tests/t-keylocate.cpp: New.