clean Post data, empty index check
Merge remote-tracking branch 'origin/experimental'
sorting of niveaus in competence grid,

and examples topic categories with left join
competence grid ad hover info example title
no breaks if 0 value, dont show 0 value
sorting bug
new handling of saving. no hidden fields anymore, bc the list of fields in php is limited to 1000
Merge remote-tracking branch 'origin/experimental'