complete specification for tree_add functions feature/tree_add

merge changes from default branch feature/tree_add

change cx_tree_link() from prepending to appending children - fixes #391

fix mixed up arguments for calloc()

add prototypes for cx_tree_add() family of functions feature/tree_add

minor doc fixes

add cxIteratorRef() macro

add missing convenience functions

fix name of collection base member (to avoid base.base)

fix inconsistent use of item_size and elem_size

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