Remove warnings

Src/Containers/FSubOctree.hpp

Src/Files/FMpiTreeBuilder.hpp

Src/GroupTree/Core/FGroupOfCells.hpp

Src/GroupTree/Core/FGroupOfParticles.hpp

Src/GroupTree/Core/FGroupTaskAlgorithm.hpp

Src/GroupTree/Core/FGroupTaskDepAlgorithm.hpp

Src/GroupTree/Core/FGroupTaskStarpuAlgorithm.hpp

Src/GroupTree/Core/FGroupTaskStarpuMpiAlgorithm.hpp

Src/Utils/FQuickSortMpi.hpp

Tests/noDist/testBlockedAlgorithm.cpp

Tests/noDist/testBlockedMpiAlgorithm.cpp