#120 added Geschaeftsbuchnummer statistic to the Buchungsbeleg report
#120 modification in Rechnungsanlage report and added Geschaeftsstatisktik
#120 deleted wrong Geschaeftsstatisktik report
#120 changed text of toggleButton Monat in TimeFilterPanel
#120 changed Kostentyp to Kostenart
#120 the user can choose in the BillingWindowSearch if he wants to see billings which are storniert or abgerechnet
#120 Changed the look of the BillingBillingEditor
#120 removed inner panel in VerwendungszweckPanel
#120 added checkboxes to ignore downloads which costs nothing
#120 reload billings after creation of Rechnungsanlage only if the billings were marked
#120 in BillingKundeAggregationRenderer and BillingKundeRenderer never ignore filters.
#120 the billings which costs nothing can be hidden in the reports from BillingKundeRenderer
#120 reordered GUI
#120 fromat the currenecy in the table as Euros
#120 renamed and replaced checkbox 'Downloads als abgerechnet kennzeichnen' in BillingKundeAggregationRenderer and BillingKundeRenderer
#120 created BillingCalculations and added method calculateBruttoSumFromBillings(). This method is used by BillingKundeAggregationRenderer and BillingKundeRenderer
#120 Changed getColumnClass() in BillingKundeAggregationRenderer and BillingKundeRenderer
#120 on start of BillingKundeAggregationRenderer and BillingKundeRenderer do not filter billings, as it might take some time.
#120 in BillingBillingEditor, the combo box to choose a Stornogrund was made read only in every case
#120 set ActionTag in BillingKundeAggregationRenderer and BillingKundeRenderer so that only admins and Billing Intern can print Rechnungsanlage and Geschaeftsstatistik