See-also: http://t.me/kde_ru_news/548

Some pkggroups were numbered (thus ordered) and some weren't;
let's make those uniform instead of depending on Latin alphabet:

kde5 -> 06_kde5
teacher -> 07_teacher
server-apps-edu -> 08_server-apps-edu
video-conferencing -> 09_video-conferencing

There's no full KDE Plasma 5 environment available on e2k yet
but many libraries, frameworks and apps are there already;
I chose to provide a distinkt pkggroup so that this subset
doesn't get confused with the whole KDE 5.