BUGFIX: Allow Doctrine object manager to appear as different class names
BUGFIX: Allow Doctrine object manager to appear as different class names

The Doctrine object manager used to be Doctrine\Common but got moved
to Doctrine\Persistence. Both are intrefaces.

Doctrine provides a compatibility layer implemented as class_alias().

There are situations where legacy code calls for Doctrine\Common, the
PHP feature of class_alias mapps to Doctrine\Persistence and Flow does
not know about it.

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