add missing header dependencies

add cx_tree_visitor()

fix another superfluous semicolon...

fix superfluous semicolon

add -lm to ldflags on Solaris

fix build in case CX_SZMUL_BUILTIN is undefined

allow freeing tree nodes on exit - fixes #377

add xml test case for the tree iterator

add visit_on_exit to iterator implementation

add depth assertion to basic tree iterator test

implement basic (enter only) tree iterator

set tree iterator stack pointer to NULL on dispose to avoid accidental double-frees

capitalize cx_array_declare()

vastly simplify tree iterators and add test for creating them

(0) -300 -100 -14 +14 +100 tip

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