Add configuration option to make disallow answering clarifications without claiming

[meisterT]

Currently claiming a clarification is purely decorative and doesn't enforce anything. The jury at the finals requested to make it actually impossible to reply to a clarification which is claimed by another jury member.

This could be a configuration setting.

[thijskh]

Is the issue that people replied to things they didn't notice were claimed by someone else? Would it already be helpful (for all installations) to have a warning at the reply box: "You are now replying to a claification claimed by X"?

[meisterT]

Multiple jury members answered the same clarification. So a dialog like you propose that checks for whether the question has been claimed or answered sounds useful.