Create MergedLab6.hs

Merged Lab6 from all of the .hs files

-- exercise 1 used from Bas file - which includes all of the properties made by Nian, Guy, Bas and Dominik
-- exercise 2 used from Bas file combined with all other team members parts
-- exercise 3 used from Guy file, although all of us had similar solutions
-- exercise 4-7 used from Dominik file
-- exercise 8 = bonus - used from Bas file