- There is also extra memory consumed in FISTA implementation, here:
	/ccpi/repos/CCPi-Framework/Wrappers/Python/cil/optimisation/algorithms
    We might reduce further 1-2 volumes if rewritten in C and temporarily variables
    are properly eleminated. We further might introduce simplified memory manager
    which will allow to give up further temporarily in FISTA and allocated them in
    regularize and, then, vice-versa.