Removed remaining traces of futest

Core/TestMachinery/CoreTest.cpp

Core/TestMachinery/FunctionalTestRegistry.cpp

Core/TestMachinery/FunctionalTestSuite.cpp

Core/TestMachinery/FunctionalTestSuite.h

Core/TestMachinery/PySuiteTest.cpp

GUI/coregui/utils/GUITest.cpp

Tests/Functional/CMakeLists.txt

Tests/Functional/Core/CMakeLists.txt

Tests/Functional/Fit/CMakeLists.txt

Tests/Functional/GUI/CMakeLists.txt

Tests/Functional/PyCore/scripts/CMakeLists.txt

Tests/Functional/PyCore/suite/CMakeLists.txt

Tests/Functional/PyFit/CMakeLists.txt

auto/Wrap/doxygen_core.i