some git improvements
realised inviocePosition dialog
rework InvoiceDialog
change units to invoicePositions in ContractEquipDialog
compute total int invoice and contract
removed unit from invoice, still have error in contracts selecting
little fixes
fix not distinct result in hibernate .list
remove default place from ContractEquipDialog
refactor DictEntity -> interface
Merge branch 'invoiceposition' into develop
Merge branch 'develop' of github.com:alexkesler/fullyequip into develop

merge with github
little fix after merge