Merge pull request #471 from JahPowerBit/v9.47.0

Merge develop and master in v9.47.0
delay mainnet multi‐sig indefinitely; delay v9.47.0 500 blocks
fix changelog (don’t mention v9.48.0 yet)
Merge branch 'v9.47.0' into develop
corrected handling of current multi‐sig testnet only support
fix changelog (don’t mention v9.48.0 yet)
fully valid data pubkeys; data pubkeys now first two (of three)
Merge branch 'develop' into v9.47.0
mainnet multi‐sig; fixes #412
Merge branch 'develop' into v9.47.0
fix integration tests
fix unit tests
skip contracts_test.py
change test ordering