Hints for kup-backup in main

Warnings

• asv-tag-duplicated
  org.kde.kup.appdata.xml:231 - project_group
  This tag must only appear once in this context. Having multiple tags of this kind is not valid.
• asv-url-homepage-missing
  org.kde.kup.appdata.xml -
  This component is missing an `url` element of type `homepage` to link to the project's homepage.
• 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-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.