work in progress old gui
empty Kruskal.java
Kruskal and Prim now extend LabyrinthBuilder
if statements collapsed, formatting
Tree datastructure
removed Tree.java again
reflected removal of Tree.java
started prim implementation with http://www.cs.washington.edu/education/courses/cse326/07su/prj2/kruskal.html
Erste erfolgreiche Labyrinth-Zeichung
revert