make clone functions return int instead of size_t

add test coverage for allocation failures in clone-function

fix hash map not being able to deal with 64-bit hashes

add documentation for cxListClone() - relates to #744

add documentation for cxMapClone() - resolves #743

add tests for cxMapClone() - relates to #743

add destruction of uninitialized entries on allocation failure to cxMapClone() - relates to #743

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mercurial