Change test naming convention
Add empty tests for ListIterator
Fix missing preamble in ListIterator.java
Add filenames to preambles
Add 'throws Exception' to test methods in LinkedListTest
Unqualify List definition in LinkedListTest
Unqualify ArrayList assignment in LinkedListTest
Add tests for next, previous and related methods
Rename ListIterator to LinkedListIterator to avoid name conflicts with java.util
Do not support add or remove in LinkedListIterator
Implement nextIndex and previousIndex in LinkedListIterator,
Add tests for nextIndex and previousIndex in LinkedListIterator