cxListDifference() sets the sorted flag if it can guarantee that default tip

add implementation for cxListDifference() - issue #745

continue to fix warnings on certain compilers due to implicit cast from fptr to bool

fix warnings on certain compilers due to implicit cast from fptr to bool

add more test coverage for new map functions and fixes some issues

simplify clone implementations

add tests for cxMapDifference() and cxMapListDifference()

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mercurial