Feature Request - simplify agent relationship attributes

[Jegelewicz]

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The relationship attributes behave differently than all of the other agent attributes. This causes confusion and requires special handling.

Describe what you're trying to accomplish
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Simplify

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Agent relationships should function the same way that status does.

1. There is a single attribute = relationship
2. attribute values are selected from a list of values:
   '''
   associate of
   bad duplicate of
   child of
   division of
   employee of
   established by
   grandchild of
   grandparent of
   not the same as
   parent of
   postdoctoral associate of
   relative of
   sibling of
   spouse of
   student of
   volunteer of
   '''
3. related agent is placed in the related agent field.

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We can keep the current format, but I think it just complicates things.

Additional context
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#7434

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[Jegelewicz]

Nobody has commented or seems to care. Closing.