Changes
* UBIK does not create error messages any more, once a new (not saved once) MetaClass gets deleted right away.
* Creation of instances of a deleted MetaClass is not possible any more.
* Problems in the visualization of Attributes are solved now.
* It is possible to derive a MetaClass from the Attributes System MetaClass now.
* A bug in handling deleted Custom system objects is fixed now.
=== Enhancements ===
* The mechanism for adding languages to the UBIK syste was improved a lot.
* An improved checking mechanism for property will avoid the accidently usage of system reserved names.
* The ACM Manager does not display unused information (like the URL of the Web Service) and controls without implemented features any more.
* Improved navigation features in the class details control.
= 2.5.1 =
