fixed bug in HDF5 beam initializer
fixed bug in HDF5 beam initializer

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