Log Message:
Update k3b to 0.12.12

Changes in 0.12.12
* Fixed another bug in the iso options code which sometimes resulted in a
  failed verification.
* Properly close the reading device when copying VideoDVDs. This bug
  resulted in a blocked device.
* Fixed handling of filenames in libdvdcss backend (this fixes VideoDVD
  copy).

Changes in 0.12.11
* Fixed selection in the audio CD ripping window.
* Fixed info block handling in WAVE audio file decoder: no more clicks at
  the end.
* Introduced a hack which fixes the "Wav detected as Mpeg file" bug.
* Fixed Auto multisession mode for DVD+RW and DVD-RW in restricted
  overwrite mode in case a previous session was imported.
* Fixed a crash with HAL >= 0.5 when exiting K3b.
* Allow copying of double layer DVDs with a size below 4.3 GB to single
  layer media.
* Support for the ring buffer in growisofs 6.0.
* Use .iso extension for images instead of .img
* Properly remove the image file in case verification failed.
* Ignore mounting state of a medium when showing its contents.
* Fixed a bug in the iso options code which sometimes resulted in a
  failed verification.
* Properly handle cue files withan image file name like
  image.bin.cue + image.bin
* Write a proper Xing header when encoding VBR mp3 files.