Add explicit casts to external C function to make example compile with stricter compiler flags.
Removes the indication that Resources is a Modelica Package

The point of the Resources directory is that one does
put any NON-Modelica material in here. So Resources should
most certainly not be marked as a Modelica package.
Removes an unnecessary "tick".
Adds missing header indicator
Adds missing colon to activate "todo" again.
Merge pull request #180 from dietmarw/syntaxFixes

Syntax fixes
Fixes #181 by making TODO list appear ONLY if condition is true

We can simply reuse the `todo_include_todos` condition.
However there is a little quirk to it when trying to hide
the TODO entry from the TOC. The conditional entry can only
be of lower level than the preceeding one. So that's why I
changed the level and put it under the "Indices and tables"
section.
Merge pull request #183 from dietmarw/ConditionalTODO

Fixes #181 by making TODO list appear ONLY if condition is true
Merge pull request #179 from dietmarw/Resources

Removes the indication that Resources is a Modelica Package
Fixes syntax of a todo statement.
Merge pull request #184 from dietmarw/fixTodo

Fixes syntax of a todo statement.
Working through Chapter 2 issues

When removing todo items I either fix them or at least add them as issues in GitHub.
Ooops, forgot to add these with last commit
Clarified one legend
Removed all existing todo items in chapter 2

In some cases, these were addressed and in others they were simply moved to GitHub.
Reordered todo

@dietmarw pointed out that it is very bad to have an index item followed by
a todo.  So I reversed the order.  He submitted a pull request for this but
since it wouldn't merge automatically, I just did it myself.

As such, this closes #190.
Added missing table

This closes #187
Updated CHANGELOG and minor CSS fix
Added discussion of the smooth operator

This closes #187
Adding some models to try and demonstrate the effect of noEvent