[gimp] (5 commits) Non-fast-forward update to branch wip/wormnest/tiff-issue-4176

[Jehan <jehanp src gnome org>]

The branch 'wip/wormnest/tiff-issue-4176' 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:

  33b6b50... plug-ins: fix #4176 color displayed wrong in multi page tif

Commits added to the branch:

  ae4daf9... Update Polish translation (*)
  3918a0a... libgimp: new metadata support concept in GimpSaveProcedure  (*)
  56bfda3... plug-ins: update file-png to new metadata handling. (*)
  3e67d7d... plug-ins: file-tiff using the new dialog generation. (*)
  3f64d1f... plug-ins: fix #4176 color displayed wrong in multi page tif

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