Fix: When disabled, all fields must be disabled. Need backport.

Conflicts:
	htdocs/projet/activity/list.php
Fix: visible task into area "time" for "My task" must limit task to
tasks i am assigned to.

Conflicts:
	htdocs/core/lib/project.lib.php
	htdocs/projet/activity/list.php
Fix: visible task into area "time" for "My task" must limit task to
tasks i am assigned to.