ouexam: Suppress question in solutions

[rbrignall]

From a conversation with Alvaro:

"What's the best way to obtain separate solutions to exam papers for external markers?"

Define something like this in the preamble:

\newenvironment{questiontext}{}{}

And use the questiontext environment as a wrapper around the text of the question:

\begin{questiontext}
The text of the question goes here.
\end{questiontext}
\begin{solution}
The solution to the question goes here
\end{solution}

Then, when you want to create a solutions document without the questions appearing, you pass the “solutions” option to ouexam.cls, and redefine the questiontext environment with the following:

\newenvironment{questiontext}{\begin{comment}}{\end{comment}}

This will make everything within questiontext not appear in the output.

[rbrignall]

Additional to a questiontext type environment: Have options to output the exam, the solutions only, or the exam + solutions.

[rbrignall]

All features added.