version 3.000
Copied lab3 and changed namespace to lab4
version 3.001
Added posibility to save and load into/from Xml-files in several ways
version 3.002
Added Runtime Serialiation
Added Data Contracts
Added Xml Serialization
version 3.003
Removed Xml Serializer as it doesn't work proper with self-created LinkedList
Added LinqToXml tests