Maintenance Release

• fix annotation block size at 64. Note this is dangerous if you have legacy annotation at 32
• add POST /blocks to annotation
• fixes to flatten-metadata
• add admin token querystring to allow selective full write
• add version-specific migration and full test suite
• allow version range for mutation log flattening
• add migrate-batch command
• enhance flatten metadata command to multi-version use
• fix multiversion flattening
• remove debug that can fill logs for large queries
• decouple CORS from Authorization
• fix dag duplication on version subset; add test
• remove transactionDB/gbucket mutex and patch
• prevent any metadata writes in read-only mode
• fix copy kv pairs to also transmit version 0 metadata per data instance
• prevent package doc in generated protobuf
• allow wildcard auth and block based on HTTP Method
• add annotation /all-elements request
• add auth file reload without reboot
• fix branch ancestry calc, initial mapping load
• add labelmap mutation JSON log
• prevent absolute path conversion from creating config entries
• add ngprecomputed backend for static Neuroglancer Precomputed GCS store
• add /keyrangevalues endpoint for keyvalue data type
• add support for confluent cloud kafka auth
• add kakfa topic creation
• update confluent kafka libs
• add auth option for just token verification
• update brainmaps API for googlevoxels
• allow CORS to be shutoff in case of nginx fronting
• return better error responses for /api/server/token
• allow wildcard access for CORS issues if auth turned off
• Ship both versions of the dvid console, leave the old version active by default