flatpak stuff kstars

e.g. kstars
Get it here: https://kstars.kde.org/download/linux/

To override the restricted sandbox install so you can save anywhere:

 flatpak override --user --filesystem=host org.kde.kstars

To copy an existing system configuration:
cp -r ~/.config/kstarsrc ~/.var/app/org.kde.kstars/config/

cp -r ~/.local/share/kstars ~/.var/app/org.kde.kstars/data/

configurations are at:
 ~/.var

Errors cleared by:
 flatpak uninstall --unused
followed by:

 flatpak repair