added basic stuff for adding cost entries
fixed issue in cost entry form with date and added further model attributes
empty forms after successfull submit
fixed issue with user foreign cost centers being shown
added overview of cost entries
added basic recurring functionality
added tooltip for recurring icon for better user experience
deletion of cost entries working
added js for enabling tooltips on recurring icons
fixed some PEP8 stuff
entering amount now possible with , instead of . as well
edited explanation for recurring
WIP: working on costentry edit
made submit button name dynamic and added cancel button to form
added sessions to admin
switched from custom monthyear widget to two normal select dropdowns and added referrer in session
made costentry form hidden by default (through collapse)
fixed error in costentry form if value is empty
auto extend collapse for cost entry form if form errors
added sorting for cost entries