Merge pull request #4558
8f3f94a Revert "CBloomFilter::clear() method" (Wladimir J. van der Laan)
98e84aa Revert "Relay double-spends, subject to anti-DOS" (Wladimir J. van der Laan)
3015e0b Revert "UI to alert of respend attempt affecting wallet." (Wladimir J. van der Laan)
39d3f2c Revert "Add -respendnotify option and new RPC data" (Wladimir J. van der Laan)
680f725 Revert "Add release notes entry" (Wladimir J. van der Laan)
ad26dc9 Revert "Formatting, spelling, comment fixes." (Wladimir J. van der Laan)
cd057bf Revert "Check signatures before respend relay" (Wladimir J. van der Laan)
67cc8f2 Revert "Remove signal DoubleSpendDetected, use function" (Wladimir J. van der Laan)