Ensure unique HTML ids for scope elements

Otherwise, undesired collapse/expand events may occur when users click
an element of the scope.

Old id format example: level3-2

New id format example: id_1-1_2-4_3-2

Explanation:

	* "id" -> Prefix needed because html ids must start with an
	  alphabetic character.

	* "_" -> Separator.

	* "1-1" -> Values pair separated by "-". The first value is the
	  level of the node. The second value is its position with
	  respect to its siblings. This is always 1-1 because is the
	  root node.

	* "_" -> Separator.

	* "2-4" -> Child node of the previous node. In this example,
	  this node its in level 2 and has the fourth position.

	* "_" -> Separator.

	* "3-2" -> Child of node "2-4" in level 3 and in the second
	  position. This is the final node in this example.

In other cases ogcp may draws deeper nodes, so it creates longer ids.
For example: id_1-1_2-1_3-2_4-1_5-1_6-1

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