Improvements for future iterations

[shoeffner]

Ideas

General

• warm up exercises?
• Earlier: function references, callback design

Session 4:

• Spread file I/O over two weeks

Session 5:

• Split?

Session 6:

• fix __init__.py to use from . import io
• mention from . import ... in lecture

Session 12:

• jump from static to animation to fast
• introduction of commands like ylim etc earlier

Session 13:

• more details about event system