[Yaml-core] Support for a common alias idiom

[derrick d. <ded...@ho...>]

YAML alias provides a way to name and subsequently cross-reference a node.

pending_orders:
    - &1
         order_num: 001
         qty:  10
         price: $100
    - &2
         order_num: 002
         qty:  5
         price: $54
...
      somewhere_else: *2

However, objects will often have attributes that uniquely identify them (in 
some scope) e.g. order_num uniquely identifies order objects. (In the work I 
do this is almost always the case).

Question: Is there a way to refer to the node &2 without by using "002" 
instead of *2?

Proposal: If not, would something in this general direction make sense?
pending_orders:
    -
         order_num: &&001
         qty:  10
         price: $100
...
    *001

Where &&001 says that "001" can be used as an alias for the PARENT of the 
current node (similarly further ancestors).

I know that YPATH and queries will allow all this, but this seems to be a 
very common idiom and this would make it more human readable / writable / 
friendly.

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