use safe memcmp also as default for the hash map - relates to # 615

remove cx_ccmp_memcmp() again - i.e. we don't provide any 3-arg cmp func in compare.h

fixes elem_size for default memcmp-based compare function not robust against reallocations

fix outdated names of the cx_ccmp functions + adds first tests for using cx_compare_func2

(0) -1000 -300 -100 -30 -10 -4 tip

mercurial