Setting security parameters according to 128 bit security (very small CKKS scaling factor)

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Adding to what @Caesar wrote. The main parameters are FirstModSize and ScalingModSize. FirstModSize should typically be larger than ScalModSize (to support messages larger in norm than unity). For NATIVE_SIZE=64 (default), FirstModSize cannot be larger than 60. ScaleModSize cannot be larger than 59 (because of the alternating logic of choosing the moduli above and below 2^{ScaleModSize}).

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