Allow users to edit proposals after imports

[microstudi]

If you import proposals from one component to another (using the import feature)
then, none the original or the imported proposals can be edited by their original authors (this only applies if the option "keep original authors" is active).

This restriction is done by the method

def editable_by?(user)
  return true if draft? && created_by?(user)

  !published_state? && within_edit_time_limit? && !copied_from_other_component? && created_by?(user)
end

Where the copied_from_other_component? affects either the imported or the original

Solution
Let's add a configuration variable to allow authors edit either the imported or the original proposals after an import:

(this image needs to add the constrains button too. This would allow to use this feature in certain places only).