Update to 2.2.15 (rhbz#2269978)
    
    - New upstream release 2.2.15
      - Bluefish 2.2.15 is a minor maintenance release
      - New feature: it can highlight the indenting level with a vertical line,
        which is very useful during python programming and helps with a lot more
        programming languages
      - Fix zencoding for python releases newer than 3.12
      - Add a retry button when opening files from a remote location
      - Tiny performance improvement when scrolling
      - Fix a bug in the bookmarks function and the visible indenting function
        that potentially could lead to a crash
      - The perl syntax detection has been greatly improved
      - YAML syntax detection has been added
      - The code has several fixes to make it compile on modern Mac OSX releases
        and to make it compile with the clang compiler
    - Hardlink identical packaged files together to save space