[easytag] (79 commits) Non-fast-forward update to branch wip/gio

[David King <davidk src gnome org>]

The branch 'wip/gio' 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:

  08151d8... Clear empty fields in MP4 tags
  914103e... WIP Use GIO when reading and writing FLAC tags

Commits added to the branch:

  ded35bd... Clear empty fields in MP4 tags (*)
  e9d1320... Use level 2 interface when reading FLAC header (*)
  9810819... Add a setting to disable automatic image types (*)
  1ab81be... Refactor Vorbis comment setting functions slightly (*)
  3bd1bc5... Fix GIOStream leak when checking for buggy id3lib (*)
  332d161... Updated Polish translation (*)
  357e5d2... Remove unused filename parameters in header code (*)
  5db73b5... Avoid GSettings handler unused parameter warnings (*)
  7352645... Use const in more places (*)
  748723d... Remove unused et_grid_attach_full() (*)
  aca762a... Use GFile in header reading functions (*)
  5f44956... Use GFile for tag reading functions (*)
  526c45a... Remove unused log area show/hide functions (*)
  ba97e21... Move log area visible logic to EtApplicationWindow (*)
  a9e5328... Remove outdated configuration file handling (*)
  19613ea... Fix settings key name for default path (*)
  dbf9021... Fix CDDB search button tooltip text (*)
  115c7ef... Do not show the PID of the application at startup (*)
  116290a... Check for gdk-pixbuf-pixdata in configure (*)
  f8250ec... Fix a MinGW build failure in EtBrowser (*)
  ef1e00b... Update Windows installer script (*)
  0d8c3be... Include GSettings schema in Windows installer (*)
  2f34a81... Use GVolumeMonitor to discover Windows drives (*)
  de1f4d9... Warn if APPDATA_XML macro is not available (*)
  222dc2b... Remove some obsolete checks from configure.ac (*)
  4aeb125... Use old-style BMPs for Windows installer images (*)
  35b184c... Update NEWS for 2.3.1 release (*)
  57b2778... Refactor Action_Select_Nth_File_By_Etfile() (*)
  7476eaa... Include name and summary in AppData (*)
  7ef0e75... Add AppData metainfo file for Nautilus extension (*)
  cef074f... Set the GError when failing to read ID3 tags (*)
  f2f4635... Fix incorrect track duration in CDDB results (*)
  43b160a... Add description to help index (*)
  0ce6608... Update strings to use ‘spaces’ and ‘underscores’ (*)
  7845f06... Simplify character pointer syntax in CDDB dialog (*)
  6582f1a... Fix a memory leak when searching albums via CDDB (*)
  6cfe0b7... Fix leaks of track number strings in CDDB dialog (*)
  b08fef9... Fix more CDDB track number memory leaks (*)
  9667450... Fix filename leak in browser DLM selection (*)
  8efaf8c... Fix leak of selected row list in CDDB dialog (*)
  ba3305e... Improve copying extra tags between files (*)
  de33ecf... Fix memory leak of a path in a browser error path (*)
  ac3c5a6... Fix several CDDB response memory leaks (*)
  642fae6... Added Serbian translation (*)
  c4e3545... Updated Polish translation (*)
  fcfd471... Make the application name translatable (*)
  728b3f7... Do not force-enable the log visiibility on startup (*)
  6a17785... Avoid a crash when reading empty FLAC tags (*)
  b83f270... Emit a critical warning for invalid FLAC artwork (*)
  4a67851... Move extended date field warning out of tag code (*)
  03418dd... Fix skipping over ID3v2 tags in Ogg files (*)
  9d1e4dc... Do not warn about ID3v2 tags when saving Ogg files (*)
  c60fd9f... Refactor Ogg file ID3v2 skipping logic (*)
  eadb07b... Fix double unref when opening an invalid Ogg file (*)
  871ec1c... Fix process-fields setting handling in scanner (*)
  7d2e5f3... Allow the tag area image treeview to expand (*)
  5e6686d... Force a margin between the tag label and the tabs (*)
  24fdf0b... Switch log message to debug in Ogg image handling (*)
  cae160e... Remove unused log.h include from tagging code (*)
  1b4bb5b... Fix tag split setting for composer in FLAC (*)
  c11c8b5... Set a GError in id3tag_write_file_v24tag() (*)
  72ec45e... Make file list selection independent of direction (*)
  c8d8692... Fix memory leaks in Save_File() error paths (*)
  afed136... Fix launching an external application (*)
  a9d84f5... Return a GError when launching external programs (*)
  6456cdf... Move file selection dialogs to application window (*)
  3d5ccb5... Remove unused et_get_file_size() (*)
  084f04a... Move busy cursor handling to application window (*)
  d5c3569... Add simple test for Convert_Duration() (*)
  4fcfe21... Add tests for DLM function (*)
  38ba361... Add tests for several picture functions (*)
  a1cf03b... Read DSF header information (*)
  6ec5ac4... Read ID3v2 tags from DSF files (*)
  57ab01d... Write ID3v2.4 tags to DSF files (*)
  67cc981... Write ID3v2.3 tags to DSF files (*)
  2504655... Move private ID3 functions into a separate header (*)
  577848d... Strip additional ID3 date fields while saving (*)
  bd76c58... WIP Add tests for DSF format support (*)
  ee27d3a... WIP Use GIO when reading and writing FLAC tags

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