Mandatory upgrade v3.5.6.2

https://github.com/gridcoin/Gridcoin-Research/releases/tag/3.6.0.2

https://github.com/gridcoin/Gridcoin-Research/releases/tag/3.6.0.1

Went into effect on block number 1010001, there was a period of instability over the hard fork moment and the network remains in a maintenance period, another day or two of stability and we'll be in a confident position to notify the exchanges/services to go live.