make names of destroy and free functions consistent - fixes #484

missing comma in map iterator docs

cxBufferFree() now calls cxBufferDestroy()

automatically disable szmul builtin when testing with coverage

improve consistency for allocator arguments - fixes #485

make ucx C++ compatible again (and add tests for it) - fixes #486

add configure option for szmul

simplify cx_array_copy() - fixes #474

major refactoring of attributes

let cxMapDestroy() ignore NULL as any free()-like function should do

(0) -300 -100 -10 +10 tip

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