Workflow for vacation requests

[zsigmondrab]

The system should provide a way for a person to request a vacation. In the requesting form, it should show the following information that are required:

1. First day of vacation
2. Last day of vacation

Furthermore, it should calculate the overall days a person will take off should they choose to send their request, taking into account special days, like public holidays or moved workdays.

The system should also incorporate a workflow mechanism that sends the request to the parties that can either approve or deny such requests. Upon approval, the system should automatically flag those days as vacations for the requesting person.