v6.1.0

• Update of PrecisionStats in ckks/precision.go:
  • The precision is now computed as the min/max/average/... of the log of the error (instead of the log of the min/max/average/... of the error).
  • fields renamed (MinPrecision -> MINLog2Prec, MaxPrecision -> MAXLog2Prec, ...)
  • rlwe.Scale has a .Log2() method
• Update of mod1.Parameters fields (made public, some removed)
• Improvement of the relinearization key-generation protocol (reduce the degree of the shares)
• Serialisation of bootstrapping keys
• Lower noise incurred by ModUp (i.e. the modulus raise step in CKKS bootstrapping)
• Evaluation keys can be compressed (public element a can be generated from a seed)
• More doc formatting
• Fix various bugs:
  • ShallowCopy of the CKKS bootstrapping evaluator and BFV evaluator not deep enough.
  • PSI example failing
  • Incorrect reset of pointer in uniform sampler
  • Error when doing inverse NTT with small degree
  • Mod1Evaluator changes the input ciphertext