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Implemented a tensorial version for ChebyshevSym kernel (currently in separate files for clarity/safety, TODO finalize and merge), cleaned up tensorial Uniform kernel.

A new loader to load results files, an example of its use, a test file for the class, and an exec to create results files have been added

Solved merge conflicts in FCheb/UnifCell, fixed and updated FCheb/UnifCell (templates are now <ORDER,NRHS,NLHS,NVALS>), some more cleanup (USE_FFT, ordering of args in new kernels ctor).

Introduced tensorial kernels for Uniform FMM (NB: Chebyshev UCB incompatible, TODO Chebyshev Sym), tested for kernel R_{,ij} and its derivative, fixed multidimensionnal fft, + some cleanup.

Change to kernel constructor prototype for Chebyshev and Uniform. Changes propagated to all Test and UTest files (I hope)