Use Drak's fork of Doctrine

Drak's fork is by far the [most popular on Packagist](https://packagist.org/search/?q=doctrine1).
It sounds like a good idea to consolidate community maintenance efforts on a single fork.
In particular the maintainer of a [strong fork by Recras](https://github.com/Recras/doctrine1) has already agreed to join in to the Drak's version.
Perhaps there is no need to maintain an LExpress' own version?