The idea here is to preserve the history of `dev` branch development and its
code when merging with the `master`. Later this code could be moved into the
masters code where appropriate.
- refactored OnBlockBlockMode to use blockPool
- syncmgr now checks for future blocks, instead of looking for a
FutureBlockErr from the Chain. This makes it so that syncmgr does not
depend on the Chain package.
- removed GetBestBlockHash function from config(unused)
- refactored all tests in the syncmgr package
* [syncmgr]
- Add blockmode, normal mode, headermode
- Add config file
- Add test files
- removed RequestBlocks and RequestHeaders from peers, as we will use
the peermanager for this
- OnHeaders and OnBlock in syncmgr, now return errors
- refactored all tests to use a convenience method to return a syncmgr
and testHelper
