Add details about chmod +a vs setfacl#6518

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pasdeloup wants to merge 5 commits intosymfony:2.3from

Sedona-Solutions:improve_setting_permissions

Commits on Apr 27, 2016

Commits on Apr 28, 2016

fix typo
pasdeloup
committed

Commits on Apr 30, 2016

break paragraph after 72 characters
pasdeloup
committed

Commits on May 4, 2016

remove notice about old ubuntu versions + rewrap paragraph
pasdeloup
committed