EST_Item* add_before

In file ../include/ling_class/EST_Relation_list.h:

## EST_Item* add_before | ## (const EST_Item* n, EST_Item* p=0)

> Add a item before node <parameter>n</parameter>, and return the new item.

## Documentation

> Add a item before node <parameter>n</parameter>, and return the new item. If <parameter>n</parameter> is the first item in the list, the new item becomes the head of the list, otherwise it is inserted between <parameter>n</parameter> and it's previous current item. If <parameter>p</parameter> is 0, make a new node for the new item, otherwise add <parameter>p</parameter> to this relation as the previous item in <parameter>n</parameter>'s relation.

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