v0.13

Notable changes:

• Add a new dedupe option: [no]rescan_files. It will increase performance in some use cases.
• New behaviors from v0.12 has been consolidated. Extent-based lookup is always enabled, as is fiemap. The v2 hashfile is no longer supported.
• Hashfile are now updated after deduplication, to reflect the new physical offsets. This avoid (re)deduplicating extents in some cases.
• Partial mode has been enhanced to support batching. The overall performance of this mode (which was previously known as "block-based mode") has been improved.
• All files are now open in readonly mode.
• Hashfile version has been increased to reflect the new database behaviors. Previous hashfiles are not compatible.
• Always compute a hash for the entire file. This let us deduplicate same files easily, regardless of their extents mappings.
• Deduplicating only parts of a file can be disabled using the [no]only_whole_files dedupe option.
• Hashfiles with unsupported features or hash algorithm are now recreated transparently. Migration of the old content is not implemented.
• Relative exclude patterns are no longer silently ingested. Such patterns are now rebuilt on top of the current working directory.
• Batching is now set to 1024 by default.