Handle user interference in ma livedocs

[ewuerger]

Assumptions:

• Sync work items are not editable by a user
• Work items created by the document renderer can't be deleted by the user
  • Generated headings must not be edited in Polarion
• A document contains no text but only work items (comment persistence)
• Work items from the sync project should not be inserted by the user inside auto generated section (this is a change in the jinja2 template)

Requirements:

• Inside a section work items inserted by the document renderer can be reordered by a user in polarion
• If a work item which wasn't present in that section of the previous run will be added to the end of the section
• A work item can be added in the auto generated section of a document
  • The work item will be placed below the work item it was placed before
  • If the work item it was placed below before is deleted or not part of the sync anymore then it will be placed above the work item it was placed before
  • If both work items (above and below) are not part of the sync anymore it will be placed in the same chapter below or above the nearest neighbor
  • If the chapter is not part of the sync anymore the work item will be placed at the end of the auto generated section