Fix missing description parameters in external_value constructor all

[PhMemmel]

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[andrewnicols]

Apologies - they were worse than we all feared.

[PhMemmel]

Thanks for the review @andrewnicols!

I tried to include your suggestions.

Is it possible you were confusing PARAM_ and VALUE_ prefixes? Please have another look at my changes. From my point of view it now everything should be correct, but of course I can be wrong :)

[andrewnicols]

That looks good to me, and demonstrates both options.

[PhMemmel]

Sorry, I forgot to push my commit, so my comments probably seemed to be pretty confusing :) Now pushed the commit.