- Implement "dsn" option to listen to activate DSN
 - Change EXT_DSN to DSN
 - Switch from dsn to no-dsn, i.e. : DSN is activate by default
 - Do not parse NOTIFY and ORCPT smtp args if DSN isn't activated
Add no-dsn directive documentation in manpage
fix typo
missing include for memset
support variadic parameters in fatal while still being allocation free
Merge branch 'master' into portable