branch boyceg: finished adv-diff ex1
branch boyceg: finished adv-diff ex1

yaojieuh/IBAMR,iamciera/IBAMR,yaojieuh/IBAMR,yaojieuh/IBAMR,yaojieuh/IBAMR,yaojieuh/IBAMR,iamciera/IBAMR,huahbo/IBAMR,iamciera/IBAMR,huahbo/IBAMR,huahbo/IBAMR,iamciera/IBAMR,huahbo/IBAMR,iamciera/IBAMR,yaojieuh/IBAMR,yaojieuh/IBAMR,iamciera/IBAMR,huahbo/IBAMR,huahbo/IBAMR,iamciera/IBAMR,huahbo/IBAMR