tree e8e64fb8327446891a69b2b90cd45ddefdf62749
parent d67635d3386caceffbaea1c79c73e2787524aeed
author Serge Bazanski <q3k@hackerspace.pl> 1605563175 +0100
committer q3k <q3k@hackerspace.pl> 1610229539 +0000

invoice: calculate GTU codes for invoice, implement some tests

Also drive-by fix two proto issues:
 - rename gtu_codes to gtu_code (following convention)
 - move denormalized Item.due_date field past denormalized comment.

Change-Id: Ibfe0a21aadc0a5d4e2f784b182e530b9603aae62