* move masternode in v2 config
* update number to meet 7 vote for current setup
* add test
* update all failed test
* fix test
* remove comment
* remove comment
* fix test
* typo and checkYourturnWithinFinalisedMasternodes func name to yourturn
* remove redundant code from verifyQC
* Verify QC to optionally pass parent header. This is used to help verifyHeaders
* move difficulty into its own file