CaseView and custom search: Using the kpunch.korder_id instead of kpunch.order_reference.
CRM/Timetrack/Form/Task/Invoice.php: postProcess to create the korder and korder_line items, various small fixes for cost/unit.
Add api/v3/Timetrackinvoicelineitem.php (API functions for invoice line items).
api/v3/Timetrackinvoice.php: implement the create() function, user the kpunch.korder_id for get, and other small fixes.