This is a prerequisite to enforcing the PSR2 coding standard through a
linter. Most of the changes can be repeated with `phpcbf
--standard=PSR2`.
One notable exception is the missing namespace at class level required
by PSR2. This rule will be skipped because it would prevent `arc
liberate` to run due to XHPAST not supporting feature newer than PHP
5.2. Namespaces have been introduced in PHP 5.3.