Respect display order for sections and enforce mandatory questions #501
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I modified the previous and next button helpers to respect the display order property of sections and allow server-side control of survey flow. I also wrote a new method to check whether all mandatory questions in a given section have been answered. This works correctly for labels, optional questions, etc. The last commit uses this method to add a configurable option which can prevent the user from moving to the next section before completing all mandatory questions in the current section.