Feature: Distinguish between post fields and task fields

[rjmackay]

Changes

• API: Mark "Post" stage as special (maybe type: post vs type: task)
  • Post stage doesn't have complete/not completed
• API: Add description and visibility for stages
• Split post fields and task fields in survey settings
• Split post fields and task fields in post edit
• Split post fields and task field in post detail
• Remove 'completed' toggle from "Post"
• API: Add is_public field to post stages
• Add "Show this task to everyone when the post is published" to task settings
• Out of scope: Add display logic for "Show this task to everyone when the post is published"
• Out of scope: "ASSIGN THIS TASK TO..." dropdown

Background:
https://github.com/ushahidi/platform-client/issues/149#issuecomment-228809927
#1262 (comment)
#1263 (comment)
#1237 (comment)
#1237 (comment)
https://github.com/ushahidi/platform-client/issues/147

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[willdoran]

Test these changes by on ushahidev:

• Survey Edit
• Add Post fields
• Add Tasks
• Add fields to Task
• Set "Require this task be completed before a post can be visible to the public"
• Save survey
• Post Edit/Detail
• Create Post from Survey with No Tasks - tasks tabs should not be displayed
• Create Post from Survey with Tasks - task tabs should be displayed
• Save Post with title and description only - task tabs should not be displayed in Post Detail
• Edit Post, add values to Task fields - task tabs and values should be displayed in Post Detail
• Edit Post, with Task where "Require this task be completed before a post can be visible to the public", do not mark Task completed, attempt to save

[jshorland]

• Add posts fields has a small design flaw. I'm going to pass the adding of fields, and have opened Radio buttons should be to the left of text, same as checkboxes #1353
• Create post from survey with tasks (tasks show): Failed. I can add the tasks in the survey edit mode, but when I add a post to the survey and save, it takes me to a screen that for some reason only shows the first and last task. I tried typing a really long task name to see what happened, but it looks like there's a scroll bar on tasks, so I don't think that would be the cause. Screenshot attached. However, when I completed the tasks in edit mode and returned to the post detail mode, I saw all of them.
  

[jshorland]

Its now working for me. All pass QA

[rjmackay]

@willdoran was is_public and "Show this task to everyone when the post is published" implemented as part of this? I know we talked about splitting this while at team meeting. However if we haven't captured that task somewhere else this issue shouldn't be closed yet.