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allow inserting questions as children of proposals and disputes

prohibit questions as children of questions

prohibit proposals as children of proposals

add column discussion_elements.question_count

• integer that counts the number of child questions a discussion element has
• count of the is incremented whenever a question is inserted

• ALTER TABLE `polarity`.`discussion_elements` 
  ADD COLUMN `question_count` INT UNSIGNED NOT NULL DEFAULT '0' AFTER `proposal_count`;
  

discussion_elements.question_count needs to be sent to the client, when a discussion is fetched