A bit of visual changes
Add ListsEditor Window
Added data.
Add Selection
Merge pull request #2 from Lozov-Petr/data

Added data.
Merge branch 'gui'
Make refactoring
Order files
Create temporary data repo
Integration
Almost end integration
Model objects have dependency properties
Remove interface implementation
BugFix: Multiple tabs in TableController
Binding data pieces through whole app
All lists in ListBoxes and Comboboxes are sorted
Add specialization headers to Table
Add specializations and years of study editor
Replace TextBoxes with ComboBoxes
Reacting on group's attribute changes (app is waiting)