SQL Command to edit postgresql.conf ("ALTER SYSTEM" patch)

https://commitfest.postgresql.org/action/patch_view?id=1005
http://archives.postgresql.org/message-id/CAA4eK1+ojx0nhXH4B0QEHexzVQn-gBP2LcF=zFppAeOr9kPgng@mail.gmail.com