[easytag] (20 commits) Non-fast-forward update to branch wip/taglib-mp4-cxx

[David King <davidk src gnome org>]

The branch 'wip/taglib-mp4-cxx' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  c041532... Use C++ TagLib API for MP4 tags
  ef47696... Support extended fields for MP4 tags
  80d6140... Add G_DECL boilerplate to picture.h
  eed3e95... Implement cover art support for MP4
  ff80f91... Support album artist in MP4 files
  50e9980... Use C++ TagLib API for MP4 header information
  4ba0469... Add GIO/TagLib compatibility layer
  ecacb00... Clean up GIO TagLib wrapper
  6f912dd... Use GIO wrappers in mp4_tag.cc
  74a033e... Use GIO wrappers in mp4_header.cc

Commits added to the branch:

  553ba87... Refactor Scan_Convert_P20_Into_Space() (*)
  dae0a35... Set default size on image properties dialogue (*)
  daf24d5... Added Telugu initial Translation (*)
  72712d7... Update supported format list in help (*)
  b6f54ea... Add help page on ID3 tag version problems (*)
  44dd9fc... Use C++ TagLib API for MP4 tags
  60d4ac0... Support extended fields for MP4 tags
  4b56861... Add G_DECL boilerplate to picture.h
  9c1eddb... Implement cover art support for MP4
  35ae720... Support album artist in MP4 files
  e7b3f28... Use C++ TagLib API for MP4 header information
  0044b87... Add GIO/TagLib compatibility layer
  ce5a17d... Clean up GIO TagLib wrapper
  c490b3a... Use GIO wrappers in mp4_tag.cc
  b2a8bf0... Use GIO wrappers in mp4_header.cc
  a0c16dd... Detect good set of warning flags for C++ compiler
  d0e1f6c... Improve error handling in GIO/TagLib wrapper
  beb0f9a... Add basic error reporting to mp4_tag.cc
  122aacc... Add basic error reporting to mp4_header.cc
  35bfa52... Remove auto pointer template

(*) This commit already existed in another branch; no separate mail sent