adds ucx_array_set() feature/array

implements ucx_array_sort() feature/array

fixes inappropriate size datatype in list merge sort feature/array

adds array interface and tests feature/array

fixes an url typo which survived surprisingly long

Added tag v2.0 for changeset 3b985a4eb05b

fixes ucx_szmul definition for gcc < 5 v2.0

adds some additional avl tree tests

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