IsCancel = True, close of issue #24
Tests are running.
IReflectiveCollection now has Extent as property
First test of subobjects is working.
Subobjects may not contain other subobjects at the moment. But this will be added
Improved error messages and Copying with references is now working.
Auto-Resolving of objects can be suppressed
Logging, when object cannot be copied
Settings objects in objects is working
Test for XmlReflectiveSequences exist
Test is running, but getAll is expected to fail
getAll is now also running
Merge branch 'Issue24' into development

Conflicts:
	src/DatenMeister.WPF/Controls/EntityFormControl.xaml
Merge branch 'Issue31_Subobjects' into development
Modifications necessary for DatenMeister.dll is finished... Open WPF
Switched to IReflectiveSequence