added module hr_worked_days_hourly_rate

This module adds hourly rate and date fields on payslip worked days. Both fields are mandatory only when a number of hours is entered.
Ah, I interpreted that as a rate: this hour computes double that normal hour and so on. Field name doesn't help either... I think it's more logicall to set it as a rate than a direct price. You set only one price, and different rates (like discounts or increments based on percentage). There are a lot of companies that works this way: an extra hour is 1.6 price of a normal hour. If you don't decide to change it, please call it price_hour or similar. A help field also helps (as its name says :wink:)

Another thing: what about other currencies in this field. Are taken into account?