clickhouse-backup

Bug fixed:

• Some directories were being created with a wrong mode, it was fixed

• Added incremental backup support for 'archive' strategy.
  Use flag --diff-from for uploading only differences between backups, like: clickhouse-backup upload <backup_name> --diff-from=<old_backup_name>. On downloading clickhouse-backup detects required backups and downloads their automatically.
• Backup format has been changed.
• Added support of environment variables. Now any option in config file can be overwritten by ENV.

The 'archive' strategy was rewritten

• now tar packaging is being executing during uploading and extracting during downloading in memory
• the support of the 5 compressing formats: 'tar', 'lz4', 'bzip2', 'gzip', 'sz', 'xz' was added
• the command 'extract' was removed as it is not necessary yet
• now the command 'create' supports backup name argument
• added possibility to specify tables list for skipping in config file

BROKEN CHANGES

• use 'create' instead 'freeze' now
• added commands: 'create', 'list', 'extract'
• rename commands: 'restore' to 'restore-data', 'create-tables' to 'restore-schema'
• now 'restore-schema', 'restore-data', 'upload', 'download' require a backup name
• now 'create', 'restore-schema', 'restore-data' support flag '--table' for specifying tables
• options backup_to_keep is separated for local and s3

legacy release