merges master changes feature/array

fixes dist_int() function in AVL tests broken on 32 bit platforms

fixes array_equals test (broken on 32 bit platforms) feature/array

adds a broader set of compare and distance functions feature/array

use qsort_s on solaris feature/array

fixes build on FreeBSD feature/array

fixes #ifdefs to be sure no redefine can ever happen feature/array

ucx_array_sort() uses qsort_r(), if available feature/array

reverts deletion of tests for ucx_array_at() feature/array

adjusts the documentation for ucx_array_sort() to the current plans feature/array

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