Entity objects modified to avoid inconsistent relationships.

Methods for managing relationships in entity objects were modified to
avoid inconsistencies. Direct access to relationship collections now is
not possible and parent/child relationship modification is done at the
same time in both entities.
Persistence context changed to EXTENDED and reload operation added.

DAO objects now are configured to use the EXTENDED persistence context.
In addition, reload operation has been added to cancel any change done
to an entity.
Experiment data view improved.

Creation of conditions, samples and replicates is completed.
Additionally, "Cancel" and "Reset" buttons now are available and work
properly.