2008/03/04: fixed rm_free (forgot to free main structure! - thanks to Andre Wehe for pointing this out)
2008/01/13: use __builtin macros for GCC instead of inline assembly in lsbset/intlog2.
2007/03/20: added bsf/bsr versions for lsbset/intlog2 in comment.
2006/08/24: modified to return the smallest position index, when there are multiple positions which give the same minimum value.
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