* [DEV-307] Implemented adding pending registry transactions.
* [DEV-307] Implemented a skeleton for the sub-network registry algorithm.
* [DEV-307] Implemented the serialization/deserialization logic for pending sub-network transactions.
* [DEV-307] Implemented marking sub-network registry transactions as successfully registered.
* [DEV-307] Implemented clearing pending sub-network entries and writing registered sub-networks.
* [DEV-307] Added comments for all the dagio functions.
* [DEV-307] Fixed a couple of bugs and added a test for checking serialization/deserialization of pending sub-network transactions.
* [DEV-307] Implemented getting a registered sub-network's gas limit.
* [DEV-307] Updated sub-network announcement transaction validation rules.
* [DEV-307] Specified what is validated.
* [DEV-307] Added initialization for lastSubNetworkID.
* [DEV-307] Renamed extractValidSubNetworkRegistryTxs to validateAndExtractSubNetworkRegistryTxs to better reflect what it does.
* Dev 303 implement block finality (#139)
* [DEV-303] Implement block finality
* [DEV-303] Add finality tests
* [DEV-303] Make finality tests use maybeAcceptBlock
* [DEV-303] Only check finality rules if we are fastAdd mode
* [DEV-303] replace hasBiggerFinalityScoreThan checks with .finalityScore()
* [DEV-307] Forgot to actually create the sub-network buckets.
* [DEV-307] Wrote a full-flow test for sub-network registry and fixed a couple of bugs that it had uncovered.
* [DEV-307] Took firstSubNetworkID out of dagconfig.Params. It's unnecessary there.
* [DEV-307] Added persistance for dag.lastSubNetworkID.
* [DEV-307] Moved sub-network stuff to their own files. Got rid of firstSubNetworkID. Replaced SubNetworkReservedLast with SubNetworkUnreservedFirst. Added ErrSubNetworkRegistry.
* [DEV-307] Added a newline at the end of dag_test.go.
* [DEV-307] Renamed previousFinalityPoint to initialFinalityPoint.
* [DEV-307] Moved sub-network IO stuff to subnetworks.go and subnetworks_test.go.
* [DEV-307] Merged dbPutRegisteredSubNetworkTx and dbRegisterSubNetwork. Fixed a too-big allocation and a block double-processing bug.
* [DEV-307] Simplified the serialized representation of a slice of transactions.
* [DEV-307] Fixed comments.
* [DEV-331] Disallowed node to run in reserved sub-networks
* [DEV-331] Added test to make sure that constant are not modified without modifying help text
* [DEV-82] break down main to packages
* [DEV-82] separate rpcserver and server
* [DEV-82] Fixed Windows-related code that failed to compile.
* [DEV-82] remove params.go and use only dagconfig.Params
* [DEV-82] fix log.go license
