add iterator over raw C arrays - closes #389

improves interface of cx_sprintf() variants

implement tree continue - fixes #376

add missing cxTreeVisitorDispose() test

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

(0) -300 -100 -15 +15 +100 tip

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