Update question table, more fields added related to different q_type.
user
```ruby
class AddQuestionTypeToQuestions < ActiveRecord::Migration
  def self.up
    add_column "questions","seq",:float, :default => nil
    add_column "questions","q_type",:string
    add_column "questions","size",:string
    add_column "questions","alternatives",:string
    add_column "questions","break_before",:boolean, :default => true
  end
end
```
assistant