Changelog

• crc32c implementation speedup (3x)
• btrfstune:
  • be more strict about option combinations and refuse changing features from incompatible groups
  • metadata_uuid changes fixes
• libbtrfs: fix ABI breakage introduced in 6.3.1, revert struct subvol_info and subvol_uuid_search changes
• check: verify metadata item level when skinny-metadata is enabled
• build fixes:
  • crc32c if PIE or relro is enabled
  • detect if PCLMUL feature is recognized by compiler and also detect that at runtime
• CI updates
  • pull request build tests enabled
  • published static binaries built with backward compatibility (-march=x86-64)
• other
  • documentation updates
  • new and updated tests
  • experimental feature updates (json, list-chunks, checksum switch)
  • code refactoring
  • remove btrfs-fragments