Hints for kup-backup in main

Warnings

• asv-releases-not-in-order
  org.kde.kup.appdata.xml - 0.8.0 << 0.9.0
  The releases are not sorted in a latest to oldest version order. This is required as some tools will assume that the latest version is always at the top. Sorting releases also increases overall readability of the metainfo file.
• asv-tag-duplicated
  org.kde.kup.appdata.xml:249 - project_group
  As per AppStream specification, the mentioned tag must only appear once in this context. Having multiple tags of this kind is not valid.
• asv-releases-not-in-order
  org.kde.kup.appdata.xml - 0.9.0 << 0.9.1
  The releases are not sorted in a latest to oldest version order. This is required as some tools will assume that the latest version is always at the top. Sorting releases also increases overall readability of the metainfo file.