Introduce new property DefaultSortProperty on ObjectClass
Defining default sort properties
Revert "Translate constant expressions"

constant expressions of type IDataObject cannot be passed to a database, so the translation is useless and causes problems with display classes and other types
This reverts commit 63fcf8f2830b3bfc3ac484df236e55ebb6e3219a.
Consider default sort property when sorting by columns
InstanceList: On reset sort, revert to initial sort
Make FormatDynamicOrderByExpression() public
InstanceList: Initializing sort by evaluating default sort property
Implement missing sort stand in values
New translatable string
NH: Mark 1:1 relations as non-cascading to avoid failures resolving circular references
Migrate ObjectClass.DefaultSortProperty to Property.DefaultSortPriority

This works around this missing EF Feature: "Creation of entities with circular references fails"
  http://entityframework.codeplex.com/workitem/142
Fixup code after migrating DefaultSortProperty