improve efficiency of multilayered indirect blocks
clean up tests
panic cleanup
clean up logic, improve readability
add final root node to the dagservice upon creation
importer: simplified dag generation
test: updated hashes using latest code
@whyrusleeping this is why the sharness tests
were failing: the hashes are added manually to
make sure our generation doesn't change.
cleanup after CR
fix merkledag tests
fix small block generation (no subblocks!)
