#10: Added possibility to select multiple parent nodes, fixed reloading of modules
#11 Added UI for questions
#11 Changed display 'valid selection options' in question UI
#10: Relations are now deleted properly
#11 Fixed bug with adding 'Valid selection options' in Firefox
#10: Changed select style to match bootstrap
#10: Fixed default sorting of jqGrids
#10: Fixed the bug with reloading of grid, improved performance for larger data sets
Refactor to Dto methods