Warning: mktime() expects at most 6 parameters, 7 given

[vaidiep]

When using the mktime() function from Safe without parameters, we get this warning :

Warning: mktime() expects at most 6 parameters, 7 given

The reason is that the parameter 7 "is_dst" has been removed in PHP 7.0.0.
(cf. http://php.net/manual/en/function.mktime.php)

[moufmouf]

Closed by #68