* cmd, eth, miner: disable advance sealing if user require

* cmd, console, miner, les, eth: wrap the miner config

* eth: remove todo

* cmd, miner: revert noadvance flag

The reason for this is: if the transaction execution is even longer
than block time, then this kind of transactions is DoS attack.

* tests: tune flaky tests that error in travis occasionally

* tests: formatting

This fixes the tests on 32bit platforms.

* core, eth: fix dependency cycle

* eth, miner: perfer to locally generated uncle

* cmd, eth, miner: make recommit configurable

* cmd, eth, les, miner: polish a bit

* miner: filter duplicate sealing work

* cmd: remove uncessary conversion

* miner: avoid microptimization in favor of cleaner code

* miner: regenerate mining work every 3 seconds

* miner: polish

* miner: stream uncle block

* miner: polish

* miner: move agent logic to worker

* miner: polish

* core: persist block before reorg