Various small fixes to the Language Spec.
More small fixes to the Language Spec, focusing on examples.
Added an initial bit of work to the Error Handling section.
Changed the Table of Contents in anticipation of coming changes.
Added a rough draft to the Design by Contract section.
Added a rough draft to the Unit Tests section.
Added a new section: Compilation.

This section deals with things specifically relating to compilation like
specific compiler features, compilation order, etc.