NOTE:**From this commit, you need to patch DB to the latest version** See sql/patch_to_0.1.5.sql
ER:requirements.php gives more details about database.
ER:The HR/counters and Validation/counters have been reworked to make appear the list of entitled days attached to contract and amployee.
ER:Changing the design of entitleddays/contract (to be reproduced on entitleddays/employee). WIP.