Adding two new versions of integer set routines:   call insert(set, other_set)   call copy(sets_a, sets_b) ! where sets_a and sets_b are arrays of sets
Adding two new versions of integer set routines:
  call insert(set, other_set)
  call copy(sets_a, sets_b) ! where sets_a and sets_b are arrays of sets

FluidityProject/multifluids,FluidityProject/multifluids,FluidityProject/multifluids,FluidityProject/multifluids