Add an interface to know what is supporting a kernel in starpu

Src/GroupTree/FGroupTaskStarpuAlgorithm.hpp

Src/GroupTree/FGroupTaskStarpuMpiAlgorithm.hpp

Src/GroupTree/FStarPUKernelCapacities.hpp

Tests/noDist/testBlockedAlgorithm.cpp

Tests/noDist/testBlockedChebyshev.cpp

Tests/noDist/testBlockedMpiAlgorithm.cpp

Tests/noDist/testBlockedMpiChebyshev.cpp

Tests/noDist/testBlockedRotation.cpp

Tests/noDist/testBlockedTree.cpp