6fa901fb47 Don't edit Chainparams after initialization (Jorge Timón)
980b38f8a1 MOVEONLY: Move versionbits info out of versionbits.o (Jorge Timón)
Pull request description:
This encapsulates the "-vbparams" option, which is only meant for regtest, directly on CRegTestParams.
This is a refactor and doesn't change functionality.
Related to https://github.com/bitcoin/bitcoin/pull/8994
Tree-SHA512: 79771d729a63a720e743a9c77d5e2d80369f072d66202a43c1304e83a7d0ef7c6103d4968a03aea9666cc89a7203c618da972124a677b38cfe62ddaeb28f9f5d