* libfs/src/imfs/imfs.h, libfs/src/imfs/imfs_creat.c,
libfs/src/imfs/imfs_initsupp.c, libfs/src/imfs/imfs_link.c,
libfs/src/imfs/imfs_load_tar.c, libfs/src/imfs/imfs_mknod.c,
libfs/src/imfs/imfs_symlink.c: Create special helper method for
creating the j-node for the root directory. This lets us assume that
every j-node created otherwise has a parent node.
Joel Sherrill
cb4e99201e