fix nonnull attribute for cx_array_insert_sorted_c_() - relates to #622

add missing compare_func2 variants of the array functions - relates to #622

add convenience array_sort functions - relates to #622

use qsort_r() when it is available - relates to #622

fix and simplify discovery of memrchr

huge refactoring of collections to add support for 3-arg compare functions

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mercurial