* Update `add_license` script
* run script
* add `remove duplicate lines script` and run it
* Revert changes `English spaces`
* strip whitespaces
* Revert `GPL` in files with `apache/mit license`
* don't append `gpl license` in files with other lic
* Don't append `gpl header` in files with other lic.
* re-ran script
* include c and cpp files too
* remove duplicate header
* rebase nit
* Firt commit.
* First non-functional but correct implementation of BasicAuthority.
Still needs:
- Sealing infrastructure.
* Punch a hole to give miner access to key store.
* Fix test built.
* Basic version of synchronous mining.
This will seal a block whenever a new transaction comes through.
To be made better we need a timer which will wait for one second after the
last block before sealing a new one - better still would be to cooperatively
interleave blocks with other sealing nodes.
* Add tests.
* Fix minor issues from repotting.
* Address grumbles.
