added basic skeleton for warehouse grouping config
created first visual mock up
added basic db sheme
added basic groups getter
removed unnecessary group renaming button (functionality taken over by input field)
added basic display of configured groups
minor visual improvements
prevent duplicate names for different groupIDs
sort by group-output by id
enabled basic group creation
refactored creatGroup
fixed GET/PUT confusion
fixed underscore display instead of whitespace
moved from static to dynamic ul initialization
implemented display update after creation of new group
added getconfig functionality for warehouse grouping
added setConfig{,JSON} to ApiHelper to reduce redundant code
implemented setConfig{,JSON} for warehouse grouping
added ApiWarhouseGrouping::setConfig to api
use warehouseGrouping setConfig