Maintenance class provides a method for getting a fresh reference
of the MW services container instance. Let's make use of these in
maintenance scripts now that we have it.
NOTE: There are still some static methods like in refreshLinks.php
that makes use of services that we can't use this method for now.
Change-Id: Idba744057577896fc97c9ecf4724db27542bf01c
php internal functions like floor/round/ceil documented to return
float, most cases the result is used as int, added casts
Found by phan strict checks
Change-Id: I92daeb0f7be8a0566fd9258f66ed3aced9a7b792
