Build-up of the RAM using COSILike for LH fit

[GallegoSav]

When we try to run multiple times the LH fit in a loop (like in the spectral fit tutorial), the memory is somehow not reinitialize and the RAM build-up until it raise a OM error.

Note that we try in a notebook or also in a regular python script.

The only solution found was to launch multiple instance of the spectral fit tutorial.