This is the full 0.6 Changelog:

0.6 rc6:
  - Implemented no reasoning ending tag "@@" which prevents the reasoner
    from being called. Only objects with direct tagging will be returned
        as query results. Very useful while doing housekeeping of the archive,
        moving files in subtags. A new constant has been defined in tagsistant.h:

          #define TAGSISTANT_QUERY_DELIMITER_NO_REASONING "@@"

        and its value is reported by stats/configuration.
        
  - Added tagsistant_querytree_check_tagging_consistency() call to:
      src/fuse_operations/rmdir.c
      src/fuse_operations/release.c
      src/fuse_operations/flush.c
      src/fuse_operations/unlink.c

  - Changed tagsistant_rename() to return EXDEV if both from and to paths
    are not taggable. This will cause calling program to use
    open-read/write-close cycle to copy files. This is required if you
    are moving myfiles/tags/t1/@/directory/files* to myfiles/tags/t2/@/
    because source files* are not tagsistant managed objects (hence
    is_taggable is 0).

0.6 rc5:
  - Fixed a bug in src/fuse_operations/readdir.c which caused the inclusion
    of '@' and '+' even after a '+/' ending path.

  - fixed a bug in mkdir() which used tagsistant_create_and_tag_object() in
    place of tagsistant_force_create_and_tag_object()

  - reduced reasoner SQL queries

  - enabled some caches, properly working

  - tagsistant_querytree_check_tagging_consistency() moved from
    tagsistant_querytree_new() to fuse_operations, where appropriated:
      getattr.c
          link.c
          mkdir.c
          mknod.c
          open.c
          symlink.c

  - mknod() created new files using provided mode_t permissions. If user
    was not granted write permission, following open() and write() calls
    would fail. I've forced S_IWUSR in mknod() mode_t permissions to fix
    the situation.

  - If requested DBD driver is not available, a message is printed

  - Debugging output uses --debug=<profile> switch, where <profile> is a
    string containing any combination of the following flags:

          b: boot
          c: cache
          f: file tree (readdir)
          F: FUSE operations (open, read, write, symlink, ...)
          l: low level
          p: plugin
          q: query parsing
          r: reasoning
          s: SQL queries
          2: deduplication

  - Implemented tag_id cache.
  
  - Implemented inode resolution by objectname and and_set cache.
  
  - Moved resoning code to reasoner.c

  - Deleted some dead code.

  - Avoided some transactions where no SQL insert/update were involved.

0.6 rc4:
  - When a tagsistant_querytree object was fetch from the cache, the
    transaction_started field were not set accordingly to
    tagsistant_querytree_new() actual parameters, thus preventing proper
    SQL transaction commit. This bug was especially evident inside
    rename() calls.
    
  - stats/ now contains some meaningful files:
      cached_queries: how many queries got cached
      configuration: the whole configuration given at run time
      connections: how many connections to SQL are active
      objects: how many objects are tagged
      relations: how many relations are established
      tags: how many tags have been created

  - repository.ini file implementation

  - removed any warning at compile time

  - code cleanup
    
0.6 rc3:
  - Queries are cached. Since a lot of time is spent by
    tagsistant_querytree_new() in reasoning the tags of a query,
    once is done a copy of the data structure is saved in a hash
    table and later reloaded. Performance improved by a 5-10x.
    
  - Tag removal (rmdir ~/mifiles/tags/a_tag/) lead to an error. Bug
    reported by Lingnan.
    
  - Speeds up reasoning by cutting one SQL query every three.

0.6 rc2:
  - Bug reported by Matei David:
      $ mkdir myfiles/tags/tag-a
      $ mkdir myfiles/tags/tag-b
      $ touch some-file
      $ cp some-file myfiles/tags/tag-a/tag-b/@/
      $ rm myfiles/tags/tag-b/@/some-file
      $ ls myfiles/tags/tag-a/@/
        ls: cannot access myfiles/tags/tag-a/@/some-file: No such file or directory

0.6 rc1:
  - Introduces universal tagging: not just files can be tagged, but
    directories and devices and pipes too.