core, eth, miner: use pure header validation

all: move common.Database to ethdb and add NewBatch

eth, rpc: standardize the chain sync progress counters

adds extradata flag

new solc api - late fixes

* use legacy version matcher
* optimise just a boolean flag
* skipf for messages in tests

Storing a value in LevelDB copies the bytes, modifying the value
afterwards does not affect the content of the database. This commit
ensures that MemDatabase satisfies the same property.

common/compiler: new solc API

rpc/comms: fix #1795, ensure IPC path exists before binding

Change go-uuid to use the current supported repository.

* adapt to new compiler versioning
* use compiler version as language version
* implement new solc API for versions >= 0.1.[2-9][0-9]* fixes #1770
* add optimize=1 to options
* backward compatibility (for now) for <= 0.1.1, and old versions (0.[2-9][0-9]*.[0-9]+)
* introduce compilerOptions to ContractInfo
* clean up flair, include full version string to version line and ContractInfo

core, core/vm, core/state: remove unused functions

godeps: pull in ethash android fix

core: split the db blocks into components, move TD out top level

cmd/geth, cmd/utils, eth: added dev mode flag

rlp: precursor changes for trie, p2p

These functions allow destructuring of raw rlp-encoded bytes
without the overhead of reflection or copying.

The bug can cause crashes if Read is called after EOF has been returned.
No code performs such calls right now, but hitting the bug gets more
likely as rlp.EncodeToReader gets used in more places.

core/state: deleted field in StateObject Copy() and unit test

agent/miner Prevent the CpuAgent to be started multiple times

Dev mode enabled some debugging flags such as:

* VM debugging mode
* Simpler proof of work
* Whisper enabled by default
* Datadir to a tmp datadir
* Maxpeers set to 0
* Gas price of 0
* Random listen port