Added work done by Taddeus on this series

Added some finishing changes and comments.

Added student data to some files.

Added/removed/updated some untracked files.

Finished the complete assignment

Added space in questions.txt.

Added another answer to question 3.

Added questions and code comments.

Source code cleanup.

Added another definition in volume.c.

Merge branch 'master' of ssh://vo20.nl/home/git/repos/uva

Conflicts:
	os/ass4/Makefile

 - Added last modifications to graphics assignment 7.