Reduce memory usage of ART #1907
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In the old version of `art_iter_prefix`, if the `partial` matches the first character, `partial_len` will always be added to `depth`, even when `partial` is not fully matched. See also armon/libart#40.
1. Reorder art_node fields to reudce struct size. 2. Apply 4-byte packing to art_leaf struct, thus the offset of art_leaf->key is equal to the size of art_leaf.
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