Ergo protocol reference client 6.1.5

This release is identical to 6.0.5 but on top of RocksDB. Use 6.0.5 if you dunno what does that mean

What's Changed

• Validate NiPoPoW proof parameters by @a-shannon in #2379
• Validate NiPoPoW proof header PoW by @a-shannon in #2396
• Fix fee estimation bounds by @a-shannon in #2410
• Reject invalid inbound NiPoPoW parameters by @a-shannon in #2417
• Preserve asset issuance with token burn requests by @a-shannon in #2430
• Bound per-peer outbound buffering by @a-shannon in #2426
• Close all live connections for blacklisted IPs by @a-shannon in #2427
• Log API queries at DEBUG level by @Ergologica in #2456
• Candidate for 6.0.4 release by @kushti in #2293
• Resume deferred ExtraIndexer catch-up without reindexing by @a-shannon in #2476
• Post 6.0.4 additional tests by @kushti in #2489

Full Changelog: v6.1.4...v6.1.5