unpack_tx(): in cython now
block_db.build_block_chain: set correct block numbers when faced with orphans
cmd_block: make forks obvious
chain_gen, longest: recursively find the longest sub-chain (will probably move from here)
tx packer
some packing util funs
removed wallet-related stuff
removed old status
pull in script-related funs
removed wallet code
tx.render: now in cython
tx.get_ecdsa_hash0: script engine
tx.verify0: script engine
removed old protocol thought-comments
unparse_script: new fun
machine.push_int: no 32-bit check
verifying_machine: machine for OP_CHECKSIG etc
dumping ground for old wallet code: to be removed