Metastorage

This release adds support for generating functions
to manage transactions. Metastorage now lets the
developer integrate handwritten code
customizations in PHP with the code of the classes
generated by Metastorage. The integration is done
without losing the customizations when the classes
are regenerated. It is also possible to retrieve
object identifiers of reference variables
(one-to-many relationships) of classes of external
components. Several bugs were fixed to handle
uncommon situations.