add default impl for some list member functions

fix inserting via iterator correctly increases element count

close feature branch feature/tree_add

merge feature/tree_add branch

rework cx_tree_add() API to allow insertion of edge nodes feature/tree_add

remove condition that is always false after recent fix feature/tree_add

fix cx_tree_search() not remembering root as a valid candidate feature/tree_add

cx_tree_add_iter() - optimize check for empty trees feature/tree_add

cx_tree_add() fix missing spec for adding duplicates feature/tree_add

complete cx_tree_add() implementations feature/tree_add

fix return type of cx_tree_node_create_func feature/tree_add

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

fix members inherited by macro or include are not documented

simplify iterator structures

fix documentation

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