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

removes cumbersome array accessor macros feature/array

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