cpp: Add first manual tests
* lang/cpp/Makefile.am: Add tests subdir. * lang/cpp/tests/Makefile.am: New. * lang/cpp/tests/README, lang/cpp/tests/run-getkey.cpp, lang/cpp/tests/run-keylist.cpp: New. * configure.ac: Configure tests makefile.
The autotests for c++ live in lang/qt/tests these
tests are more for manual experiments to validate some
functionality.