* Avoid PHP 7.2 warnings in DBConRefTest about count() on non-Countable
* Suppress "Headers already sent" in PHP 7.2 too
* (T206476) Output only to stderr in unit tests
* (T207112) Add session_write_close() calls to SessionManager tests
* oyejorge/less.php replaced with our fork wikimedia/less.php
* (T209756) Updated wikimedia/ip-set from 1.2.0 to 1.3.0.
* Avoid PHP 7.2 warnings in DBConRefTest about count() on non-Countable
* Suppress "Headers already sent" in PHP 7.2 too
* (T206476) Output only to stderr in unit tests
* (T207112) Add session_write_close() calls to SessionManager tests
* oyejorge/less.php replaced with our fork wikimedia/less.php
* (T209756) Updated wikimedia/ip-set from 1.2.0 to 1.3.0.