This removes various remains of historical test tools, and the entire
tests/arthur directory. The living parts are now:
tests/auto/lancelot - including the suite of qps scripts. The
script engine now lives here.
tests/baselineserver - moved to toplevel since not arthur-specific.
tests/manual/lance - for manual running and editing of qps scripts.
Reviewed-by: Qt Sanity Bot <firstname.lastname@example.org>
Reviewed-by: Gunnar Sletta <email@example.com>