• fix detection of intermediate super block flags (e.g. csum change and other conversions)
• raid-stripe-tree support (still experimental):
  • moved under experimental build flags (mkfs, convert)
  • format change, removed encoding type; backward incompatible
• receive dump: escape special chars in xattr names and values, and clone source path
• tune change csum: fix reservation size when starting a transaction
• other:
  • new and updated tests
  • updated CI images, new reference build targets
  • cleanups and refactoring