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This constructor's aim was to provide a static_assert message that would
indicate the error. This could have hindered sfinae as the constructor
was seen as existing without failing compilation early.

The function is not necessary since FBasicParticle inherits from
std::tuple. Use std::get instead.

The variadic constructor stores the attributes passed as parameters. The
error was not clear when too many attributes were passed.

Introduced in 16b3a43f.

Conflicts:
	CMakeModules/morse/find/FindFFTW.cmake
	Src/Utils/FDft.hpp

The level that is required by the existing constructor is superfluous.

FTreeCoordinate and FPoint have a lot of methods in common. FTreeCoordinate now
inherits from FPoint to avoid code duplication.