[test] updated some tests due to the new cache mecanise : setMaxSize method is currently missing
[src] cosmetics. added some comments for easy debugging
[src] removed useless intermediate variables
[src] Fixed the computePDF on grid methods for both 1D and 2D: exception
replaces the warning
Return of analytical values in case of analytical computation of pdf, which
makes calculations faster
Fixed some comments within the docstring
[test] added analytical 3D case. Ongoing work
[test] updated test_3U_2_nondiag test: the denity function is evaluated on a
grid using computePDFOn2DGrid method and plot of output iso pdf values
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