hr_attendance_analysis - many contracts for same employee

[Laetitia Gangloff (Acsone)]

Prerequisite: install module hr_attendance_analysis on database with demo data, and set admin user as member of attendance group. (to install this module the bug https://bugs.launchpad.net/hr-timesheet/+bug/1193384 need to be corrected)

First case :
1/ Create a contract for a user with attendance (do not fill trial period) and set end date
2/ Create a contract for the same user (do not fill trial period) and set other start date and end date (not in the first period)
3/ It is not possible to save this new contract

Second case :
1/ Create a contract for a user with attendance (do not fill trial period) and set end date
2/ In the "more" menu choose the duplicate action
3/ It is not possible to create a duplicate,it is normal because there is the same period than the original, so I propose to set start date with the biggest end date. If the biggest end date is False, do nothing.

Third case :
The test to get active contract returns contract without trial period. A contract without trial period is not always an active contract.