if you track stale blocks, then you quickly overflow your ring buffer in the local network case where you're mining every block and generating a lot of stales.

This helps determine which blocks are unlikely to end up as uncles

 * Store the 5 most recent locally mined block numbers
 * On every imported block, check if the 5-deep block num is in that store
 * Also confirm that the block is signed with miner's coinbase

Why not just check the coinbase? This log is useful if you're running
multiple miners and want to know if *this* miner is performing well.

core/vm, rpc: added disasm to `ext_` RPC

core: added RPC sign back in

Add StateTests/RandomTests and VMTests/RandomTests

make registrar available in console

automatic DAG pregeneration for smooth epoch transitions

Fix two additional download vulnerabilities

- backend: AutoDAG bool flag passed from cli/eth.Config to ethereum, autoDAG loop started if true
- backend: autoDAG loop start/stop, remove previous DAG
- cli: AutoDAG bool flag, off by default, but automatically ON if mining
- admin jsre: add startAutoDAG stopAutoDAG and makeDAG in miner section
- switch on/off DAG autogeneration when miner started/stopped on console

prefix dapp key/value entries in extradb

Tests updates

Cleanup

core/vm: optimisation on RETURN and updated tests

Storing tx receipts in extraDb

CLI, JSRE admin and  Solc improvements 

eth/downloader: fix test to it doesn't time out on a slow machine

eth: fix odd method names in peer set