Fix : warning was not calculated on the right date

Conflicts:
	htdocs/projet/class/project.class.php

Fix: Error management on project edit.

Conflicts:
	htdocs/compta/facture.php

tasks i am assigned to.

tasks i am assigned to.

Conflicts:
	htdocs/core/lib/project.lib.php
	htdocs/projet/activity/list.php

Conflicts:
	htdocs/projet/activity/list.php

failed.

Conflicts:
	htdocs/holiday/class/holiday.class.php
	htdocs/holiday/fiche.php