Fix: A lot of fix into project permissions. Uniformize code.

htdocs/core/lib/company.lib.php

htdocs/core/lib/project.lib.php

htdocs/projet/class/project.class.php

htdocs/projet/contact.php

htdocs/projet/document.php

htdocs/projet/element.php

htdocs/projet/fiche.php

htdocs/projet/ganttview.php

htdocs/projet/index.php

htdocs/projet/liste.php

htdocs/projet/note.php

htdocs/projet/tasks.php

htdocs/projet/tasks/document.php