updates documenting comments

documents UCX_STREAM_COPY_BUFSIZE

fixes ucx_sprintf macro and adds tests for sprintf and bprintf

changes ucx_stream_Xcopy API

removes superfluous UCX_VERSION macro

fixes UCX_FOREACH documentation

fixed misaligned memory access in test_ucx_buffer_write

fixed further usages of SIZE_MAX

removed dependency to stdint.h in stack header

added casts for mallocs in AVL implementation (to satisfy c++ compiler)

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