[IMP] hr_holidays: Improve leave type: limit date, visibility, usability

In order to help limit leaves recording errors. We need to add some
configuration on leave type object. For example we need to avoid people
taking legal leaves 2016 on 2017.

  * Add validity dates : start and end dates on the leave type. An empty
    end date means forever
  * Double validation : change the checkbox into a radio button with now
    three choices :
  	- Human Resource Responsible
	- Manager
	- Double Validation
  * Add a sequence field, using handle widget
  * Add a field, to specify if the employee can select the leave type in
    his allocations, requests or in both of them

0 files changed, 0 insertions, 0 deletions