- Ensures ports remain open and client are responsive to IX requests.
- Completely 100% decentralized. This farms out the work of checking the masternode network to the masternode network. 1% of the network is determistically selected to check another 1% of the network each block. It takes six separate checks to deactivate a node, thus making it tamper proof.
- Nodes are kept in the masternode list if they fail enough PoSe checks to deactivate. They will continue to be checked until the operator fixes them. However they will not be paid while they're failing checks.

masternode.conf was broken when any index other than 0 was
used. This fixes it and allows the correct input to be selected
and the masternode to be started successfully.

- Made masternodes/darksend compatible with regression testing mode (a local-only blockchain that doesn't require mining). Developers can now test multiple rounds in a few minutes without waiting on mining (much faster).
- Added dsee security verification to v11
- darkSendMasternodes -> vecMasternodes (must clearer)

- Fixed matching engine issue causing false positive non-denominational matches
- Basic masternode support for regtest (still not working)

- refactored CActiveMasternode
- added masternodeconfig to handle remote masternode configuration
- read masternodeconfig upon init
- new masternode rpc commands: stop-many, start-alias, stop-alias, list-conf
- added notCapableReason field for better handling not capable issues

This doesn't include any of the changes in the darkcoin/v0.10.18.x branch. Those will be brought over into this commit history.