Generate up next slide and destroy old slides
Use inkscape to generate PNG images from scheduleslides
Check if svg-file exists before trying to read it
remove now redundant .defined_groups. from #index
Update todo to match current status
Add scaffolding for planned actions in admincontroller
New method: require_global_admin
require global admin for the admincontroller
Use the new require_global_admin filter instead of controller specific cludge