Changelog

• subvolume delete: add new option to do recursive subvolume deletion (for regular user delete only accessible subvolumes)
• mkfs:
• new option --subvol to create subvolumes in given paths, read-write, read-only and default
• add hard link detection support for --rootdir option
• fixes:
• receive: message verbosity fixes
• check: fix false positive report of missing checksum for extent holes
• check: handle compressed extents when checking tree log
• when asking Y/N user questions, flush the terminal so the question is displayed (e.g. btrfstune -S)
• other
• code refactoring, error handling
• python packaging fixes
• documentation updates
• new tests