#31 multiple customer support in CidsBillingSearchStatement
#31 use joins to filter out the user logins
#31 corrected error in CidsBillingSearchStatement.appendUserIds()
#31 added filter for abrechnungsturnus
#31 changed filter for kostenart
#31 created MetaObjectNodesBillingSearchStatement
#31 created MetaObjectNodesBillingSearchStatement
#31 hide billings which are storniert or abgerechnet
#31 added a possibility to ignore the time filter