MT#5879 Intermediate state before start datepeacker field.
MT#5879 Ajax form works
MT#5879 Save a lot of comments before deletion
MT#5879 Clean up queries a little.
MT#5879 Invoice deletion draft
MT#5879 Delete works

Left:
 resend invoice to email form
 separated interface for generation without filter by filter by contact/contract id
Known issues:
 tooltip makes table to flick. But not on the last button in column.
 seems like fnDraw takes data from localstorage - although invoice deleted -
 it is still shown in datatables.