#17 Ad-hoc billing cycle

[urugamai]

As a randomly employed consultant I dont always want to bill on a cycle but bill at end of project or activity. Setting weekly meant a 3 week job generated 3 invoices but setting monthly meant waiting another week before billing. So I have added Ad-hoc which bills from last bill to NOW and Last Week End which bills from last bill to the latest Week End (for ad-hoc but on-going projects).

Patch attached.

Manual step:

insert into human_readable_codes (level, system, code, code_value, code_hr, appearance_order) VALUES (0, '*', 'projects_billcycle', 'Ad-Hoc', 'Ad-Hoc', 60 ), (0, '*', 'projects_billcycle', 'LastWeekEnd', 'Last Week End', 50 );