interim commit.  added "dual" approximate projection solver.
interim commit.  added "dual" approximate projection solver.

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