Log Message:
Update to 2.7:

Changes in 2.7
* Rewrite of the mungefilename function.
* Support added for downloading album art.
* Support added for ripping with libcdio (cd-paranoia).
* Some error checking and a small help file added to abcde-musicbrainz-tool.
* Substantial renovations of m4a encoding with a choice now between encoding
  with faac, NeroAacEnc and fdkaac.
* Fixes to USEPIPES with the addition of several new encoders and rippers.
  Details on USEPIPES now available in the abcde FAQ doc.
* Support added for encoding with Monkey's Audio (ape), tagging is with
  Robert Muth's apetag.
* Support added for encoding with WavPack.
* mp3 tagging renovated with version sniffing differentiating between eyeD3
  versions. Tagging formalised with options now for id3, id3v2 and eyeD3.
* Many, many bug fixes. See the changelog for more details.