MyLinkedList added (uncomplete)
MyLinkedList: added same methods
Minor changes (comments)
Completed MyLinkedList
added Tree interface
added replaceElement method to interface tree
Added class MyTree (uncomplete)
added some methods to MyTree
Merge branch 'master' of https://github.com/PeterSchwab/AlgoDataFS13

Conflicts:
	src/examples/MyLinkedList.java
	src/examples/MyQueue.java
corrected an error
Saving changes.
Quick & dirty implementation of a tree print-out