added average function to get running costs
index on feature/AddAverage: 8b7c929 added average function to get running costs
added average to table
fixed average computation for zero'ed costs
added get average running costs
fixed bug: missing output buffering
use generic approach for average / non-average distinction
refactored set general costs to delete on zero
fixed bug: missing json encoding
adjusted display of average values
flatened hirarchy in average data
added average processing for running costs
adjusted display of average and dates
moved average from running costs to helper (to include general costs)
moved table handling to seperate method
small text adjustment
minor correction
remove old running costs configuration
added default parameters to getRunningCostsTable
refactored amazon value k calculation