add documentation for cxMapDifference() and cxMapListDifference()

default NULL allocator to cxDefaultAllocator

add implementations for map difference

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

(0) -1000 -300 -100 -30 -10 -7 +7 tip

mercurial