Updated submodule.
Added script for publishing images to SourceForge.
Removed obsolete code.
Add a custom boot menu for the severs

* Also add a meb hook for installing the koetilapalvelin-ha package.
Updated paths.
Updated version number.
Removed submodule digabi-repository (moving to https://).
Re-added submodule digabi-repository (with https://).
Disabled alternative for start-here.svg.
Merge pull request #55 from digabi/server-boot-menu

Add a custom boot menu for the severs
Removed plymouth-drm from Depends.
Adding xbacklight for backlight control support.