exam new patch to add support for the choice, environment and others.

[Uwe Brauer]

Hi all

The following patch adds support for the choice checkbox environment
etc.

One thing I could not figure out well, in that patch

  \begin{checkboxes}
    \choice
           ^cursor
  \end{checkboxes}

But it should be

  \begin{checkboxes}
    \choice
            ^cursor
  \end{checkboxes}

I tried several things, none worked, maybe someone can fix that before
applying the patch to master?

Regards

Uwe Brauer

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