core/vm: added str to op

accounts, crypto: fixed file naming for windows

miner, xeth: fire log event during mining. Fix return raw tx

eth/downloader: drop peer if advertised TD but won't delvier

eth: calculate the correct TD, only update if better

eth, ethdb: fix a data race during startup/shutdown

Core uint64 ts

added net.version

Adjust .mailmap

web3 update

ParamsToAddress no longer aborts the process, it now returns an error
instead so that the caller can handle the error properly.

all: update license information and godoc comments

This version is less clever. All names are listed in a single file,
AUTHORS. All source files have the same header. This is an improvement
over the previous version, which attempted to list copyright holders in
each source file.