Merge branch 'master' of https://github.com/X9Developers/XSN

Updated version. Fixed 0 commission tpos reward distribution

Bumped version. Removed creating of legacy contracts. Enabled creatin…

…g of new contracts by default

Bumped version. Removed creating of legacy contracts. Enabled creatin…

…g of new contracts by default

Fixed invalid initialization of TPoSContract

Added RPC functionallity to zap watch only addresses

Updated tposcontract rpc call to accept txid

New diff algo (#147)

* Added new difficulty algorithm based on exponential difficulty retargeting

* Added hardfork conditions. Fixed issue with signmessage and tposcontract cleanup

* Reverted difficulty changes. Implementing PoSV3 stake modifiers

* Fixes to hardfork transition

* Reverted testing changes. Changed where pos block is checked

* Changed upgrage height. Reverted some old changes

* Updated hf details

* Updated version

* Changed hf payments

* Changed hardfork date

add missing locks (#144)

* add missing locks in GetMasternodeOutpointAndKeys

properly locks mutex before selecing masternode collaterals
with AvailableCoins

* add missing lock in miner

properly lock mutex before calling TestBlockValidity

More updates regarding block timedrift fix